WO1999040561A1 - Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device - Google Patents

Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device Download PDF

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Publication number
WO1999040561A1
WO1999040561A1 PCT/JP1999/000552 JP9900552W WO9940561A1 WO 1999040561 A1 WO1999040561 A1 WO 1999040561A1 JP 9900552 W JP9900552 W JP 9900552W WO 9940561 A1 WO9940561 A1 WO 9940561A1
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WO
WIPO (PCT)
Prior art keywords
display
voltage
liquid crystal
driving
period
Prior art date
Application number
PCT/JP1999/000552
Other languages
French (fr)
Japanese (ja)
Inventor
Suguru Yamazaki
Original Assignee
Seiko Epson Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2766598 priority Critical
Priority to JP10/27665 priority
Priority to JP10/291211 priority
Priority to JP29121198 priority
Application filed by Seiko Epson Corporation filed Critical Seiko Epson Corporation
Publication of WO1999040561A1 publication Critical patent/WO1999040561A1/en

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3692Details of drivers for data electrodes suitable for passive matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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    • GPHYSICS
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
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    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3666Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3674Details of drivers for scan electrodes
    • G09G3/3681Details of drivers for scan electrodes suitable for passive matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3696Generation of voltages supplied to electrode drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/04Partial updating of the display screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/06Details of flat display driving waveforms
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/028Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/18Use of a frame buffer in a display terminal, inclusive of the display panel
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2092Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/367Control of matrices with row and column drivers with a nonlinear element in series with the liquid crystal cell, e.g. a diode, or M.I.M. element

Abstract

An electro-optical device having a function that only part of the display screen can be made displayable and the other part can be made nondisplayable, wherein for the nondisplay region, the voltage applied to scanning electrodes is fixed to a nonselection voltage, and the voltage applied to signal electrodes is fixed at a similar level to the one in the case of full-screen on-display or full-screen off-display, thereby lowering the power consumption in a partial display state.

Description

Bright fine manual electro-optical device and a driving method thereof, a liquid crystal display and a driving method thereof,

Driving circuit for an electro-optical device and an electronic apparatus,

〔Technical field〕

The present invention only relates to an electro-optical device and a driving method thereof having a function of and is a child of the other part in a non-display state and the display state portion of the display screen. The present onset Ming, a liquid crystal display device as an electro-optical device, a liquid crystal display device that displays driving method and thereby the liquid crystal display device capable of partial display state of low power consumption no discomfort to the display . Also it relates to a driving circuit suitable for driving an electro-optical device of the present invention.

Further relates to an electronic device using these electro-optical device and a liquid crystal display device on the display device.

Background of the Invention

In the portable electronic device such as a mobile phone Yore, the display device has been, the display number of dots so that more information can be displayed has come to increase year by year, consumption by the display equipment with it power has also come to increase. Power of the portable electronic device is generally it is strongly demanded Me is a low power consumption in the display device so as to be long battery der because battery life. Therefore, while the display state full screen when required in large display devices the number of display dots, normal state only as a display state partial region of the display panel to allow reduced power consumption, the other region how to a non-display state is beginning to be studied. In addition, the portable display device of an electronic apparatus, also the need for low power consumption, the display panel is needed use reflection-type or transflective liquid crystal display panel with an emphasis on appearance of the reflection mode.

Function in the conventional liquid crystal display device, but those are often having a display / non-display can be controlled function of the entire screen, and only some display state of the entire screen, you the other part in a non-display state those with have not yet been put to practical use. Only some of the rows of the liquid crystal display panel and Viewing state, JP-A-6- 95621 and No. Hei 7 _ 281632 is proposed as a method for realizing a function capable of other lines in the non-display state ing. Both changing the display duty in the two proposals both cases partial display and the case of the full-screen display, a method of changing the drive voltage and the bias ratio to suit each duty.

Illustrating a driving method of JP-A-6- 95621 below with reference to FIGS. 19 to 21. Figure 19 is a proc view of the conventional liquid crystal display device. Block 51 is the LCD Display panel (LCD panel), a substrate formed with a plurality of forming the scanning electrode substrate and a plurality of signal electrodes are arranged to face at a distance of a few 〃 m, the the gap the liquid crystal is sealed. By the liquid crystal at the intersection of the signal electrode disposed on the scanning electrodes and the column direction are arranged in the row direction, pixels (dots) are arranged in a matrix form. Block 52 denotes a scanning electrode driving circuit for driving the scan electrodes (Y driver), the block 53 is a signal electrode driving circuit for driving the signal electrodes (X driver). A plurality of voltage levels necessary for driving the liquid crystal is formed in the drive voltage generating circuit of proc 54, it is applied to the liquid crystal display panel 51 via the X driver 53 and Y driver 52. Block 57 is a scanning control circuit that controls the number of scanning should do the scanning electrodes. Proc 55 is a controller for supplying signals necessary for these circuits, FRM denotes a frame start signal, CLY scanning-signal transfer clock, CLX De Isseki transfer clock, Dat a display data, LP data latch signal, PD is the partial display control signal. Block 56 is the power source of the circuit described above.

And if this conventional example part displayed in the left-half screen, although described with a further case of the upper half screen of them, wherein the lower half screen and the display state line above the latter half screen is description will be given of a case that the line as the non-display state. The number of scan electrodes shall be the 400. The controller 55 is a non-display state lower half screen in the "H" level partial display control signal PD. Full screen is a display state by scanning the entire scanning electrodes in 1/400 duty when the control signal PD is at the "L" level, the control signal PD is at the "H" level scanning of the upper half of the panel in the case of only the upper half screen and the remaining lower half screen display state is on purpose part display form that the non-display state by that you scan 1/200 du one tee electrode. 1/200 switching to duty is one row by half the number of clocks in one frame period by switching the cycle of the scanning-signal transfer clock CLY to double. Although not described more scan stop method of the lower half screen of the scan electrodes in the partial display state, when it is determined from the internal circuit diagram of the scanning control circuit block 5 7, control signal PD "H" when the level Y driver data transfer from the 0 0 stage Shift register evening of the inner to 2 0 1 stage is fixed to the "L" level, the resulting 2 0 1 th to 4 0 0-th Y driver that is supplied to the scan electrodes 2 0 1 th to 4 0 0-th output is a method of keeping the non-selected voltage level.

2 0 is an example of a drive voltage waveform when displaying a horizontal line at every scanning electrodes one at partial display state of this conventional example. A is the upper half screen voltage waveform applied to one pixel with a, B is a voltage waveform applied to all the pixels of the lower half screen. Waveform A, bold line at B in the figure scanning electrode driving waveforms, thin lines indicate signal electrode driving waveforms.

Upper half screen of the scan electrodes during the selection period (one horizontal scanning period: 1 H) sequentially line by line select voltage V 0 for each (or V 5) is applied, to the scan electrodes of the other row non-selection voltage V 4 (or VI) is applied. The signal electrodes are sequentially applied on / off information of each pixel of the selected row in synchronism with the horizontal scanning period. More specifically, during the V 0 is the voltage applied to the scanning electrodes of the selected row is V 5 to the signal electrodes of ON pixels in the selected row, the signal electrodes of OFF pixels V 3 is applied. Further, while the voltage applied to the scanning electrodes of the selected row of V 5 is V 0 to the signal electrodes of ON pixels in the selected row, Ru V 2 is applied to the signal electrodes of OFF pixels. Voltage applied to the liquid crystal of each pixel is Saden pressure between the scan voltage (selection voltage and a non-selection voltage) and the signal applied voltage to the signal electrodes applied to the scan electrode (on-voltage and off-voltage), basic the effective voltage of the differential voltage is higher pixel is turned on, a low pixel is turned off in the manner.

On the other hand, the effective voltage of the pixel of the lower half screen for the selection voltage to the scanning electrodes as shown in B of FIG. 2 0 not added at all, is considerably smaller fence than the effective voltage applied to the off-pixels of the upper half screen as a result, the lower half screen is completely a non-display state.

As shown in the liquid crystal AC driving signal M, Fig. 2 0 has a diagram for signal polarity switching of the driving voltage for each selection period of one three rows. For high duty driving in order to reduce flicker and crosstalk, it is necessary to perform signal polarity switching of the thus ten rows of selection period every driving voltage. Although the lower half screen is is a hidden, since the voltage applied to the scanning electrodes and signal electrodes in the non-display region is changed as shown in B of FIG. 2 0, even in the partial display state, the circuit of the driver such as a liquid crystal behavior and pixels have also been charged and discharged, there is a disadvantage that power consumption is not so much reduced.

In the liquid crystal display panel of the simple matrix method is necessary to set the change of the driving voltage when the switch the display duty. It will be described with reference to FIG. 21 which is an internal circuit of the driving voltage forming block 54 this point below.

First will be described a configuration and functions of Figure 21. Than about 1/30 du one tee to drive the liquid crystal display panel of high duty will require 6 level voltage V 0 to V 5. The maximum voltage applied to the liquid crystal is V 0-V 5, the V 0 is used as an input power supply voltage of + 5 V. Taking out a voltage V 5 which contrast Bok becomes optimal from the input supply of 24V - variable resistor RV 1 and transistor Q 1, by Ri and 0 V to for contrast adjustment. Resistor R. 1 to: divide the voltage of R5 by V0- V5 divided intermediate voltage formed to output a V 1~V4 increase the driving capability of the voltage between among them the operational amplifier OP 1~ΟΡ 4. Sweep rate Dzuchi S 2 a and S 2b is either one of R 3 a and R3 b is connected in series state and R 2 · R4 in accordance with the level of a interlocking Suitsuchi signal PD. By keeping with different resistance value of R 3 a and R 3 b, the V0~V 5 different voltage division ratio depending on the level of the PD can that form.

Between ¥ 0~ 5 ¥ 0- ¥ 1 = V 1- V2 = V3- V4 = V4- V5 has relationship of the voltage division ratio (VO- VI) / (V0-V5) and the bias ratio and call. When the Du one tee and 1 / N, preferable bias ratio is 1 / (1 N) is Japanese Patent Publication 57 - disclosed in JP 57 718. Therefore, by setting for R 3 a and R 3 b each 1/400 duty for a 1/200 duty resistance value, it can be driven by a preferred bias ratio in each de utility.

When switching duty is changed at the same time the driving voltage as well as switching the bias ratio (VO- V5) is also required. Switching duty while fixing the driving voltage from 1/400 1/200, it is switched bias ratio to a preferred value contrast Bok becomes remarkably poor display. This is because the effective voltage applied to the liquid crystal for selection voltage Rereru time is doubled involved in the liquid crystal becomes too high. Whereas is described in detail the need and its implementation means for switching the bias ratio in the conventional example, the need for the drive voltage switching that there is no detailed description about the implementation means.

Specifically when the duty and 1 / N, in the case of N >> 1 must be adjusted in proportion to N URN ho a (VO- V5). For example, the if 28 V a optimal (VO- V5) in case of 1/400 duty, in case of 1/200 duty is necessary to adjusted to 28 V / 2 = 20 V (V 0-V5) is there. This voltage adjustment is made to be performed by a device user contrast adjusting variable resistor RV 1 each time the switching between the upper half screen display state and the full-screen display state is adjusted, it is very took the device user is that inconvenient. Although additional drive voltage automatic setting means is mandatory, the driving voltage forming circuit because it is not as easy as Roh Iasu ratio switching means will be greatly complicated. Although it is described that this is the conventional publications in the semi-screen display can be further reduced power consumption because only a small driving voltage, drops voltage 8 V to thereby heat the contrast adjustment transistor Q 1 for it would spent a significant portion, power consumption does not decrease to less.

When the partial display is considerably smaller and ten lines to 20 lines before and after the switching the duty accordingly, preferable bias ratio is 1/3 or 1/4. 5 level in the case of 1/4 bias rather than a required voltage 6 level in the liquid crystal drive, a 4-level in the case of 1/3 bias. 5 when the level of the voltage is required the resistance of the side connected to the partial display of the resistor R 3 a and R 3 b it is sufficient to 0 Omega but, if four levels of voltage is required resistor R 3 a or R 3 rather than b, and resistors R 2 and R 4 means a 0 Omega is required. Although JP-A-7- two hundred and eighty-one thousand six hundred and thirty-two describes switching means cut replacement means and the driving voltage of the bias ratio of these cases, omitted further explanation about their construction here.

The methods proposed so far as described above, that a part of only the display status line of the liquid crystal display panel, the function itself of the other rows in the non-display state becomes possible, reduce the extent Ru power mower as possible. However, it can considerably complicate the driving voltage forming circuit, or the number of rows that can partially display too long and hard-limited, there is a problem that power consumption is still inadequate.

Further, the former JP-6-9562 No. 1 is related to a transmission type liquid crystal display panel, the latter JP-7 No. 281632 is attached der connexion display mode only describes a method of partial display not disclose Absent. However, when focused on the liquid crystal Display device it is reflective if a transmission is a high contrast, in the conventional normally - had adopted a display panel of black liquid. The reason for this is as follows.

Normally - in the case of white Preparative than a gap between dots to which no voltage is applied it becomes white, but a white display portion in the screen is sufficiently white, though not the black display portion is sufficiently black against a no since the gap between dots to which no voltage is applied to black in the case of a normally black type, but the black display portion is sufficiently black, white display is not sufficiently white. Since the white table radical 113 black display unit is better is sufficiently black become high table shows the contrast Bok than is sufficiently white, the better to adopt the display panel of Roh one Mali one black-type high contrast Bok It will be obtained.

Note that the normally black type, the effective voltage applied to the liquid crystal becomes black display in the case was off voltage have lower than the threshold value of the liquid crystal, the applied voltage by increasing a turn-on voltage is applied to not higher than the threshold value of the liquid crystal it is a mode in which a white display. On the other hand, the normally white Preparative becomes a Shirohyo shown when the effective voltage applied to the liquid crystal was low off voltage than the threshold value of the liquid crystal, the application of a higher ON voltage than the threshold value of the liquid crystal to increase the effective voltage it is a mode in which a black display. For example, when using the Tsu chair Tetsu de nematic liquid crystal of about 9 0 ° twist, the liquid crystal display panel has a pair of polarizing plates on both sides of the panel, substantially parallel to the transmission axis of the pair of polarizers placing the Roh one Mali one black liquid, placing by substantially orthogonal a normally white preparative.

Figure 1 8 is a diagram illustrating a partial display state in the case of using the liquid crystal display panel 1 0 7 normally black type. Since the liquid crystal to the off-voltage or less of the effective voltage of the non-display region is applied, the non-display region as in FIG become display black. On the other hand, in the reflective type liquid crystal display panel, characters and black display to the easily viewable display bright and reflect incident light, it is necessary to white display background. However, in the reflection type liquid crystal display panel of the normally black type, the non-display area is the partial display state of discomfort called black whereas the background display area is white. Furthermore, the display dots positioned at the boundary between the display area and the non-display area on the display screen, dot WINCH black display and the adjacent dots of the black display dot Bok constituting the display area side character and the non-display region side becomes, since become One tethered in order to visually recognize, there is a problem that characters displayed on the display dot Bok of the boundary portion between the non-display area is difficult very readable in the display area. The non-display region so that there is no discomfort for the white display is necessary to apply an on voltage to the liquid crystal in the non-display region, but although the basically region should be hidden it with a non-display state Absent. Assuming the case where a non-display region tried cane in white display, not only the power consumption of the circuit can not be reduced to realize it, on arranging the liquid crystal molecules are horizontally off state as a nematic liquid crystal in the case rises in the state, the liquid crystal of the dielectric constant of the oN state since the larger 2-3 times the permittivity of the liquid crystal in the off state, when driving the liquid crystal to turn on the non-display area as you'll white display of the liquid crystal layer discharge current due to the AC driving is increased, the power consumption of the entire display device is either not reduced significantly as compared with the case of full-screen display state, a problem that one be greater in the opposite occurs.

As described above, when employing the display panel of the simple normally black for contrast enhancement, in the partial display state becomes display the non-display area is an unnatural as black. Also, when an attempt'll hidden area to white display with no uncomfortable feeling, on the hard to say that the basic part display function is realized, purpose nor fulfill power consumption reduced. The present invention is to solve the problems in the above prior art, the power consumption at the time of partial display is an object to provide an electro-optical device greatly reduced. Moreover, without complicating the driving voltage forming circuit for partial display function, and the size and position of the partial display is an object to provide a high electro-optical device versatile that can be set by software also , in the case of using a liquid crystal display device as an electro-optical device, and an object thereof is to provide a liquid crystal display device capable of significantly reducing the time power consumption is to realize a display with no Oite discomfort partial display state.

Another object is to provide a structure of a drive circuit suitable for driving an electro-optical device of the present invention.

Further, by using an electro-optical device or a liquid crystal display device having these partial display function in the display device, and an object thereof is to provide an electronic apparatus to which the power consumption.

The present invention DISCLOSURE OF THE INVENTION, a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving method of an electro-optical device having the function of partially display area a display screen, before Symbol the scanning electrodes in the display region, a non-selective voltage is applied to the non-selection period to apply a selection voltage to the selection period, the and the period other than the selection period for the scanning electrodes of the display region, to all the scanning electrodes least a predetermined time period even if the voltage applied to all the signal electrodes fixes the applied voltage by fixing, characterized in that the display screen and a partial display state. According to the present invention, in some cases partial and regions only the display area display, the potential of all the scanning electrodes and all the signal electrodes is at least a predetermined period is fixed, the liquid crystal layer and the electrodes an electro-optic material discharge is not made period in the drive circuit or the like occurs, its amount, and low power consumption.

Further, in the method of driving an electro-optical device of the present invention, preferred to the voltage of the scanning electrodes in all periods of fixing the applied voltage to the scan electrodes and the non-selection voltage arbitrariness. Since the voltage of the scanning electrodes to be fixed to the case of the partial display are the non-selection voltage, it is possible to constitute a driving circuit with a simple circuit.

Further, in the method of driving an electro-optical device of the present invention, it is preferable that the non-selective voltage is 1 level. During access period in the non-display area, since the non-selection voltage can be fixed to one level no voltage change, it can be a low power consumption.

Furthermore, the period in the driving method for an electro-optical device of the present invention, forming circuit of the drive voltage applied to the scanning electrode and the signal electrode, to fix the respective voltage applied to all the scanning electrodes and all the signal electrodes the preferably operates stopped. More specifically, the driving voltage forming circuit includes a charge pump circuit for generating a boosted voltage or low voltage is switched in response to connection of a plurality of capacitors to the clock, the Chiya temporary pump circuit, all scan electrodes and the duration of fixing the voltage applied to the their respective to all of the signal electrodes, it is preferable that the operation was stopped. By doing so, the period of the partial display state, it is possible to reduce the power consumption of the driving voltage forming circuit. If you are using a charge 'pump circuit to the boost / buck voltage by stopping the timing clock for switching the capacitor can be low reducing wasteful power consumption.

Relates the present invention described above, one driving method for the non-selective voltage is only one level of simplicity Ma Bok Rikusu liquid crystal Display apparatus, MLS multiple rows of scanning electrodes are simultaneously selected (Multi- Line-Selection) drive a method called, the other one is a method called drive SA which scanning electrodes are selected row by row (Smart-Addressing). By the This combining the driving voltage forming circuit composed of such a driving dynamic method and the charge pump circuit, proposed in International Patent Publication WO 9 6/2 1 8 8 0 to be able to significantly reduce the power consumption of the liquid crystal display device did. The present invention is based on the method of WO 9 6/2 1 8 8 0, by developing so that it can cope with partial display function, those which attained less power consumption.

The period other than the selection period in the scanning electrodes in the display region, a period other than the period in which the select voltage to the display line is applied (hereinafter referred to as non-display line access period that this period

), And this time, by fixing the potential of all the scanning electrodes and all the signal electrodes, it is possible to significantly reduce the power consumption of the driving circuit of this period, the electro-optical device has a low power consumption. Further, if the operation stop charge pump circuit of the driving voltage forming circuit in this period, there is no charging and discharging of capacitors therein, further comprising a low power consumption. This period fits to the extent no power consumption of the drive circuit is not the ho Tondo discharge capacitor which holds a very small since the driving voltage, also the charge pump circuit is stopped operating the variation of the driving voltage practical problem .

Further, in the method of driving an electro-optical device of the present invention, the first display mode and a non-display state display part of the area state, the other areas of the display screen to display the entire state of the display screen it is preferable not period change for applying a selection voltage to the scanning electrodes of said display area in the second and a display mode, and the first display mode before Symbol second display mode to . According to the present invention, the time for applying a selection voltage to the scanning electrodes in the display area in the case when the partial display of the full screen is the same, i.e., the duty is the same. Therefore, changing the bias ratio and driving voltage at the time of partial display is unnecessary, it needs a driver circuit and a driving voltage forming circuit without complicating.

Furthermore, the method of driving an electro-optical device of the present invention, the first display mode and said second display mode, the effective voltage applied to the liquid crystal of pixels in the display area in the display state as but the same, it is preferable to set the potential applied to the signal electrodes in the period other than the selection period for the scanning electrodes of the display region. By the present invention lever, in the case of full-screen when the display and the partial screen display, the potential of the signal electrodes so that the effective voltage applied to Ru electrooptic material der display area liquid crystal becomes the same in the two cases set to Runode, can so as not to change the contrast of the display area.

Further, in the method of driving an electro-optical device of the present invention, the potential applied to the signal electrodes in the period other than the selection period for the scanning electrodes of said display area on the display or off the display when the first display mode it is preferable to set the same as the voltage applied to the signal electrodes in the case of. Since use as a signal voltage at the full-screen display state, the drive circuit and the drive control can be simplified.

Further, in the method of driving an electro-optical device of the present invention, the plurality of scan electrodes, and simultaneous selection for each predetermined number of units are driven so as to sequentially select each number predetermined unit, before Symbol second display mode it turned the applied voltage to the signal electrodes in the case of the display or off the display is the same as the voltage applied to the signal electrodes in the case of full-screen oN-display or full screen oFF-display in said first display mode at the time of It is preferred. Thereby, in the MLS driving method, with the effective voltage can be the same applied to the liquid crystal of the display area of ​​the display area in the case where the partial screen display full screen, if the partial screen display quality it is possible to maintain the good. An increase in the circuit scale also requires very small. Further, in the method of driving an electro-optical device of the present invention, the potential applied to the signal electrodes in the period other than the selection period for the scanning electrodes of the display area, for each of the plant constant period for one screen scan, full screen preferably set switch to alternately and applied potential of case of applied potential and off display when turning on the display in the display state. Further, in the method of driving an electro-optical device of the present invention, in the period other than the selection period for the scanning electrodes of said display area in the second display mode, the polarity of the voltage difference between the signal electrode and the scan electrode it is preferable that the inverted every frame. In doing so, the power consumption of the non-table 示行 access period can be greatly reduced. When the partial display lines smaller (e.g. extent 6 0 line below), the pixel quality of the entire screen be fixed liquid crystal driving voltage in the non-display lines are not deteriorated.

Further, the present invention includes a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, Te driving method smell of an electro-optical device having a function to display screen partially display area of ​​the display region the scanning electrode, a non-selective voltage is applied between the non-selection period to apply a selection voltage to the selection period, and the scan electrode of the other area of ​​the display screen, the non without applying the selection voltage to apply a selected voltage, for all of the signal electrodes, at least long have period than the same-polarity driving period in the polarity inversion driving when the full-screen display state by fixing the applied voltage, the partial display the display screen characterized by a state. According to the present invention, in some cases partial and regions only the display area display, the potential of all the scanning electrodes and all the signal electrodes is a predetermined time period is fixed, the liquid crystal layer and electrodes an electro-optic material period charging and discharging of the driving circuit or the like is not performed is generated, correspondingly, a low power consumption.

Furthermore, the method of driving an electro-optical device of the present invention, the at least every period longer than the same-polarity driving period in the polarity inversion driving when the full-screen display state, the voltage applied to the signal electrodes, full screen it is preferable to switch alternately to the potential of the case of potential and O full display when turning on the display in the state. Even between hidden line access period, since the polarity inversion periodically driving voltage can be prevented DC voltage application or crosstalk to the liquid crystal.

The driving method of the above electro-optical device can be realized by a simple matrix liquid crystal display device or an active matrix type liquid crystal display device.

Furthermore, the electro-optical device of the present invention, the above driving method was used to characterized in that it is driven in the electro-optical device, thereby making it a child provide an electro-optical device that is low power consumption.

Further, the electro-optical device of the present invention, a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, Oite the electro-optical device having a function to display screen partially display area, the plurality the scanning electrodes, the selected voltage is applied to the selection period, the scanning electrode driving circuit for applying a Hisen-option voltage in the non-selection period, the multiple signal electrodes, to best match the signal voltage to the display de Isseki and the signal electrode driving circuit for applying a setting means for setting the position information of the partial display area in the display screen, based on the position information set in said setting means, driving said scanning electrode driving circuit and the signal electrode and control means that to output the partial display control signal for controlling the circuit, the scan electrode driving circuit and the signal electrode driving circuit in accordance with the prior SL partial display control signal, the display area of ​​the display screen said scanning electrodes And the signal electrode is driven so that the display corresponding to the display data, is to the scan electrodes in the non-display region in the display screen, characterized in that a non-display state to continue applying a non-selection voltage . According to the present invention, the duty in hardware circuits for the partial display, bias ratio, the liquid crystal driving because of that change the dynamic voltage like is not required, controlling the number of lines and positions of display lines or non-display line circuit it is possible to set in the registry evening. The number of rows section partial view and position by way it is possible to provide a high electro-optical device versatile that can be set by software.

The electro-optical device can be realized as a simple matrix type liquid crystal display device or an active matrix type liquid crystal display device.

The driving circuit for an electro-optical device of the present invention, a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving circuit of the electro-optical device having a function to display screen partially visible region in the first driving means for applying a voltage to the plurality of scan electrodes, comprising a memory circuit of the display de Isseki, the voltage selected depending on Isseki the display de read here more and a second driving means for applying a voltage to the signal electrodes of the previous SL first drive means, the scanning electrodes of said display area, non-in Rutotomoni non-selection period to apply a selection voltage to the selected period a selection voltage is applied, the and the scanning electrodes of the other area of ​​the display screen has the function of applying only the non-selection voltage, the second driving means, selection of the scanning electrodes of said display region Table from the storage circuit in the period corresponding to the period Reads Isseki de, in other periods, characterized in that it has a function of fixing the display data reading Adoresu of the storage circuit. According to the present invention, by stopping the operation of reading the display de Isseki from the memory circuit incorporated in the signal electrode driving circuit, the current consumption of the signal electrode driving circuit of the non-display line access period to near zero Ru can be reduced. At this time, if the fixed reading display information to one or zero, can fix the output of the signal electrode driving circuit to the same potential as that of the full screen on the display or full-screen OFF-display. Furthermore, in the electro-optical device of the present invention, in a period other than between the selected period of the scanning electrodes of the display region is preferably formed to stop the Shift register evening shift operation in the first drive means. According to the present invention, this period is the scanning electrode driving circuit for not outputting the selected voltage, 必 short no Shift register evening internal drive circuit scan electrodes is operating. Lever to stop the Shift register evening operation by stopping the shift clock can reduce the power consumption of the scanning electrode driving circuit in this period approximately zero. The driving circuit for an electro-optical device of the present invention, a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving circuit of the electro-optical device having a function to display screen partially visible region in, in accordance with the shift register evening shift operation, has a scan electrode driving circuit for sequentially applying a selection voltage to the plurality of scan electrodes, the dynamic circuit drive for the scanning electrodes, and the display screen partially visible region when, the above the scanning electrodes of the display area of ​​the display screen by applying a selection voltage to the selection period in accordance with the shift register evening shift operation, the scan electrodes in the other area of ​​the display screen the shift register evening stop the shifting operation in developing, it is applied only the non-selection voltage, the scan electrode driving circuit shifts from a state in which the partial display region a display screen to full-screen display state When, characterized in that it has an initial setting unit for the Shift register evening and initial state. According to the present invention, it is possible from the partial display state during the transition to full-screen display state, without 査 run from the middle of the scanning electrodes is started, start scanning of the scanning electrodes from the first line. Further, the electro-optical device of the present invention, a driving circuit of the electro-optical device, thereby characterized in that it has a scanning electrode and a signal electrode is driven, thereby capable of partial display, low power consumption it is possible to provide an electro-optical device that is.

Further, the electro-optical device of the present invention, a plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, Oite the electro-optical device having a function to display screen partially display area, the plurality a first driving means for the voltage applied to the scanning electrode, the voltage-applying voltage selected according to the display data read out from here comprises a memory circuit of the display data to the signal electrodes of the multiple and a second driving means, said first drive means, the scanning electrodes in the display area before Symbol display screen, a non-selective voltage is applied between the non-selection 択期 to apply a selection voltage to the selection period and the scanning electrodes other areas of the display screen has a function of applying only the non-selection voltage, said second drive means to said plurality of signal electrodes, said display region whether the memory circuit in the selection period of the scanning electrodes Applying a et read out a voltage based on the display de Isseki was characterized by having a function of applying a voltage that is based on the same display data in the other periods. According to the present invention, by stopping the operation of reading the display de Isseki from the memory circuit incorporated in the signal electrode driving circuit, the current consumption of the signal electrode driving circuit of the non-display line access period to near zero it can be reduced. Furthermore, in the electro-optical device of the present invention, in a period other than between the selected period of the scanning electrodes of said display area, said second driving means, the same polarity driving definitive polarity inversion driving when the full-screen display state at least every period longer than the period, the applied voltage to the signal electrodes, it is preferable to switch alternately to the potential of the case of the potential and off display when turning on the display in the full screen display state. Be a non-display line access period, since the polarity inversion periodically driving voltage can be prevented DC voltage application or crosstalk to the liquid crystal.

Further, in the above-described electro-optical device of the present invention, a drive voltage generating circuit for supplying to said driving means applying voltages formed by the to the scan electrode or the signal electrode, the driving voltage forming circuit, the applied includes a contrast adjustment circuit for adjusting the voltage of the voltage, in a period other than the selection period for the scanning electrodes of the display region is preferably formed to stop the operation of the contrast adjustment circuit. Since power consumption in the driving circuit of the electro-optical device hidden line access period of the present invention is very small, during which if holding the driving voltage in the capacitor is small fluctuation of the drive voltage to stop the contrast adjustment circuit practical problems is not. It can be further reduce the amount of power consumption of the drive circuit by stopping the contrast adjustment circuit.

The driving method of the liquid crystal display device of the present invention, and a partial region display state of the entire screen of the liquid crystal display panel, the non-display state portions capable of displaying status reflective type or transflective other regions wherein the driving method of the type liquid crystal display device, as well as the liquid crystal display panel and Roh one Mali one white type, that is in the partial display state to apply the off-voltage following the effective voltage to the liquid crystal of the non-display region to. Since the non-display area in the partial display state by employing a normally one white type is white can be realized meaningless display of discomfort. Further, the power consumption as a circuit means for applying the effective voltage liquid crystal off voltage following the non-display area can be used small and easy means, further, the liquid crystal of the liquid crystal of the dielectric constant of the non-display region is small discharge current due to the AC driving the smaller the full screen is possible significantly to reduce the power consumption of the display device as a whole than when the display state.

Further, in the driving method of the liquid crystal display device, the liquid crystal display panel is a simple Matrix mode liquid crystal panel, it is preferable to apply a non-selection voltage only to the scanning electrodes of the non-display region in said partial display state. Further, the liquid crystal display panel is a simple matrix liquid crystal panel, it is preferable to apply only the voltage as the off display to the signal electrode of the non-display area in the partial display state.

Further, in the driving method of the liquid crystal display device, the liquid crystal display panel is a Akuti blanking matrix liquid crystal panel, the liquid crystal to the off-voltage of the pixel of at least the first frame the non-display region in which transition to the partial display state the following voltage is applied, it is not preferable to apply a non-selection voltage only from subsequent frames to the scan electrodes of the non-display area. Further, the liquid crystal display panel is an active matrix type liquid crystal panel, at least in the first frame moves to the partial display state by applying a liquid to the off-voltage following voltage of the pixel of the non-display area, from the subsequent frame the access period in the non-display region is preferably applied only off voltage or lower voltage to the signal electrodes.

Thus, the partial display area in the row direction and the column direction of the display screen, it is possible to hide it except. Further, since a liquid crystal display panel of the normally white type, the non-display area less discomfort white display and summer Te display, also because it does not apply a high voltage applied to the pixel of the non-display region, to reduce power consumption can.

The liquid crystal display device of the present invention, the driving method using the features a Rukoto the driving of the liquid crystal display device, whereby less discomfort also display a partial display state, low power consumption liquid crystal display device it is possible to provide a.

The electronic device of the present invention, it is possible to provide an electro-optical device using an electro-optical device and the liquid crystal display device of the present invention as a display device. In particular, if the electronic equipment is powered by a battery, and more to reduce the power consumption of the display device, it is possible to greatly extend the battery life.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is proc view of a liquid crystal display device according to an embodiment of the present invention.

Figure 2 is proc diagram of a drive voltage generating circuit used in the embodiment of the present invention.

Figure 3 is a timing diagram of the embodiment of the present invention.

Figure 4 is a diagram for explaining a liquid crystal driving voltage waveforms in the first embodiment of the present invention, A represents a selection voltage V s field (C om pattern) FIG, B is replaced with the display pattern sheet (Rule 26) 15/1 shows Figure, C is a diagram showing a signal electrode driving voltage V s display Pas evening over emissions.

In figure A, Y4n + l~Y4n + 4 is that means the fourth row which is selected (η = 0, 1, 2, ···, 49). 1 VH, - 1 means the VL. Matrix A is the case of the liquid crystal AC driving signal M is "L", reversing the soil in the case of M is "H". In drawing B, dl~d 4 shows the ON / O off state of the pixels in the fourth row which is selected. The ON pixels - represents 1, the off-pixel at 1.

In figure C, the operation result, 0 is VC, ± 2 is VI, ± 4 means Judges V2. C matrix is ​​the case of the liquid crystal AC driving signal M is "L", M is the case of "H" soil is reversed.

Figure 5 is a partial view of a control circuit in the embodiment of the present invention.

Replacement sheets (Tadashikai IJ26) 1 6 6 timing diagram illustrating the operation of the circuit of Figure 5.

Figure 7 is a timing diagram of another embodiment of the present invention.

Figure 8 is proc view of a liquid crystal drive voltage generating circuit used in another embodiment of the present invention. Figure 9 is a timing diagram of another embodiment of the present invention.

Figure 1 0 is a timing diagram of another embodiment of the present invention.

Figure 1 1 is a partial Proc view of the signal electrode driving circuit in the embodiment of the present invention. 1 2 proc diagram of the scan electrode driving circuit in the embodiment of the present invention.

Figure 1 3 is a circuit diagram of the contrast adjustment circuit in the embodiment of the present invention.

Figure for Figure 1 4 is for explaining the partial display state in the liquid crystal display device of the present invention. Diagram showing a configuration example of a liquid crystal display device of FIG. 1. 5 present invention.

Figure 1 6 is a timing diagram illustrating the operation of the liquid crystal display device of FIG 5.

Figure 1 7 is a diagram for explaining the transition to the partial display state from the full-screen display state on the liquid crystal display device of FIG 5.

Figure for Figure 1 8 is for explaining the partial display state in a conventional liquid crystal display device.

Figure 1 9 is proc view of a conventional liquid crystal display device having the partial display function.

2 0 driving voltage waveform diagram of a liquid crystal display device of FIG 9.

Figure 2 1 is a detailed circuit diagram of a drive voltage generating circuit in FIG 9.

2 2 is an equivalent circuit diagram of a pixel of an active matrix liquid crystal display panel having two-terminal type nonlinear element in pixels.

2 3 is an equivalent circuit diagram of a pixel of an active matrix type liquid crystal display panel having transistors on the pixels.

Schematic view of an electronic apparatus using FIG. 4 as a display device an electro-optical device and a liquid crystal display device of the present invention.

2 5 a circuit block diagram of an electronic apparatus of the present invention.

1 5 1 liquid crystal display panel

2 5 2 scan electrode driving circuit (Y driver)

3 5 3 signal electrode driving circuit (X Doraino ^

4 5 4 liquid crystal driving voltage generating circuit

5 5 5 LCD controller 17

6, 56 ...

7, 17 BOOST / step-down clock forming circuit 8 ... negative sextuple boosting circuit

9, 20 ... double boosting circuit

10 ... negative direction double boosting circuit

1 1, 12, 19 ... 1/2 step-down circuit

13, 21 ... contrast adjustment circuit

14

15 partial display control signal forming section

16 AND gate

18 negative direction eight times the step-up circuit

? 2 precharge signal generation circuit

23 line Adoresu generation circuit

24 31 ... C om pattern generating circuit

25 display data RAM

26 reads the display data control circuit

ML S decoder for 27 X driver

28, 34 ... level shift evening

29, 35 ... voltage selector

30 - • initial setting signal generating circuit

32, '- Schiff Torejisu evening

33 - - ML S decoder for the Y driver

57 - • scanning control circuit

107 ... normally one black type liquid crystal display panel FRM ... frame start signal of the (screen scanning start signal) CA · '• field start signal

CL Y ... scanning signal transfer clock

CLX ... data transfer clock

Dat a, D n ... display de Isseki 18

LP, LP I ... de Isseki latch signal

PD, CNT, PDH ... partial display control signal

Don ... display control signal

V cc ... the input power supply voltage

GND ... ground potential

VEE ... negative side high voltage

VH ... positive selection voltage

VL ... negative-side selection voltage

VC ... the non-selection voltage (center potential)

Judges VI, Judges V2, soil VX and VC) signal voltage V0~V5 ... liquid crystal driving voltage

fl~f 4 ... field delimiters

M ... liquid crystal AC drive signal

Xn ... signal electrode

Υ1~Υ 200, Υ4 η + ι~Υ4 η + 4 ...

RV, RV 1 ... variable resistance

Qb, Q 1 ... bipolar transistor

Qn ... n-channel MO S transistor

Rl, R 2, R 3 a, R3b, R4, R 5 resistance S 2 a, S 2 b ... Suitsuchi

OP 1 ~ ΟΡ 4 ...

D ... partial display area

VS ... positive selection voltage

MVS ... negative-side selection voltage

VX ... positive signal voltage

MVX ... negative signal voltage

[BEST MODE FOR CARRYING OUT THE INVENTION

It will be described below with reference to preferred embodiments of the present invention with reference to the drawings <1 9 Figure 1 is a block diagram showing a liquid crystal display apparatus of the first embodiment of the electro-optical device according to the present invention. First, its configuration will be described. Block 1 is a super one Dzuisuteddo nematic (STN) type simple matrix type using a liquid crystal of the liquid crystal display panel (LCD panel), a substrate formed with a plurality of substrates and a plurality of signal electrodes forming the scanning electrodes a few / is arranged to face at a distance of m, the liquid crystal described above is sealed in the gap. By the liquid crystal at the intersection of the plurality of scanning electrodes and a plurality of signal electrodes, pixels (dots) are arranged in a Matrigel box shape. Further, formed by arranging a polarizing element such as a retardation plate or a polarizing plate as required on the outer surface side of the substrate.

The liquid crystal is not only STN used in the present embodiment, the liquid crystal molecules are twisted by type (TN-type, etc.), the type oriented Homeoto port pick, the type and the vertically oriented, such as memory types, such as a ferroelectric, it can be variously used. Further, it may be a liquid crystal of light-scattering type as polymer dispersed liquid crystal. The liquid crystal display panel, but may be a semi-transmissive be transmissive or reflective, reflective and semi-transmissive in order to reduce power consumption is preferable. If the color of the liquid crystal display panel 1 forms a color one fill evening on the inner surface of the substrate is switched in time series of three colors of light emission of the lighting device it can be considered methods such. Proc 2 is a scanning electrode driving circuit for driving the scanning electrodes of the liquid crystal display panel (Y Dora I bar), Proc. 3 is a signal electrode driving circuit for driving the signal electrodes of the liquid crystal display panel (X driver). A plurality of voltage levels necessary for driving the liquid crystal is formed in the driving voltage forming circuit block 4, it is applied to the liquid crystal display panel 1 through the X driver 3 and the Y driver 2. Block 5 is the controller port over La supplies signals necessary for these circuits, PD is the partial display control signal, FRM denotes a frame start signal, CLX De one evening transfer clock, D ata in Isseki view de is there. LP is a data latch signal, also functions as a scanning-signal transfer clock and a driving voltage forming circuit clock. Pro click 6 is the power source of the circuit described above.

The controller 5, is shown the driving voltage forming circuit 4, X driver 3 and the Y driver 2 as discrete blocks, but they need not have become separate IC, and co Ntoro one la 5 Y driver 2 or or is incorporated in the X driver 3, the driving voltage forming circuit without regard be incorporated into the Y driver 2 or the X driver 3, not may be the driver of the X and Y on one chip IC, further, these circuits may be 20 combined into one chip IC the Te to base. Also, these circuit blocks are also the liquid crystal display panel 1 disposed on another substrate, or placed as an IC on a substrate constituting the liquid crystal display panel 1, be arranged crowded creating circuits on board good.

The liquid crystal display device of the present invention are the simple matrix type, the voltage applied to scan electrodes of the non-selected rows is using a method of driving only one level, the drive circuit is simplified, power consumption can be reduced . The non-selection voltage is to prepare second voltage level in response to the polarity of the voltage applied to the liquid crystal, it may be adopted driving method for alternately selecting it in response to the polarity reversal. In particular, in an active Ma Torikusu type liquid crystal display device having a two-terminal type nonlinear element will be described later in pixels, such a driving method is used conventionally. The driving voltage forming circuit block 4 of Figure 1 is composed of Ji Yaji. Pump circuit main portion is increased or decreased voltage. It is also possible to use a step-up / down circuit other than the charge 'pump circuit.

The liquid crystal display panel 1 is the number of lines as an example there 200 (number of scanning electrodes) are all, when needed is a full-screen display state (full-screen mode), of the 200 lines in the standby or the like only 40 lines is a display state, and the remaining 160 lines becomes a non-display state (partial display mode). A specific driving method will be described in the following individual embodiments. (First Embodiment)

Here with reference to FIGS. 2-4, four rows of the scanning electrodes are simultaneously selected, 4MLS the driving method (hereinafter referred to as simultaneous selection is performed in the scanning electrode units successively four rows (Multi-Line-S election) driving method It described an example of a case of performing a partial display by using a representative). It will be described with reference to FIG. 2 which is a block diagram an example of a driving voltage forming circuit 4 for 4 MLS driving not a or.

ML S non selected voltage VC as in the driving method (scanning voltage output by the Y driver 2) scan signal voltage (positive voltage relative to the VC) positive selection voltage VH, relative to the negative-side selection voltage VL (VC three voltage levels between the negative side voltage) is required. Here, VH and VL are symmetrical about the VC. Judges V 2 as the 4MLS driving method (signal voltages output by an X driver 3) signal voltage and VI, will require an five voltage levels of VC and V2, each corresponding voltage each other Saturdays V 1 VC it is symmetrical about the. Circuit in Figure 2 as an input power supply voltage (Vcc- GND), a de-Isseki latch signal LP as a clock source for the 2 first charge pump circuit, and outputs a higher voltage. Special and unless below the GND as a reference (0V), described as Vc c = 3 V. As used each GND and Vc c in VC and V2 of the liquid crystal driving voltage.

Proc 7 is a step-up / step-down clock forming circuit to form a two-phase clock having a narrow time interval for operating the charge pump circuit from the de Isseki latch signal LP. Block 8 is a negative direction sextuple boosting circuit, VEE = a 6 times the voltage in the negative direction to the input supply voltage on the basis of the Vc c as an input power source voltage to (Vcc- GND) - to form a 15V. In the following, the negative direction indicates the direction of the negative voltage relative to the predetermined voltage, the positive direction also indicating a direction of a positive voltage. Block 13 is necessary negative selection voltage VL (for example, - 1 IV) to a contrast adjustment circuits for extracting from VEE, constituted by resistors and bipolar 'transistor. Block 9 is the double boosting circuit for forming the positive-side selection voltage VH, a VH (e.g., 1 IV) is twice the voltage of the input voltage in the positive direction relative to the VL as an input voltage (GND-VL) Form.

Block 10 is a negative-direction double boosting circuit, to form one V 2 = -3 V is twice the voltage of the input power supply voltage in the negative direction relative to Vc c as an input supply voltage (Vcc- GND) . Block 11 is a 1/2 step-down circuit to form Vl = -1. 5V is a voltage obtained by stepping down it to 1/2 as the input power supply voltage (Vcc- GND). Pro click 12 is also a 1/2 step-down circuit, to form one V 1 = 1. 5 V is the voltage obtained by stepping down it to 1/2 as the input power supply voltage [GND-(-V2)].

Voltage can be formed necessary 4MLS driving method above. Block 8-12 each a step-up / step-down circuit of the charge-pump method. Drive voltage generating circuit according to the step-up / step-down circuit such Chiya temporary pump system has a high power supply efficiency, it is possible to drive the liquid crystal display device with low power consumption by 4ML S driving method. Note that each of Chiya temporary pump circuit blocks 8-12 a known configuration, as an example for the boost circuit, after charging the input voltage by connecting a capacitor to the N parallel, the N if connected in series capacitor N times the boosted voltage of the input voltage is obtained, after the capacitor of the same capacity if the step-down circuit charging the input voltage from both ends by connecting the N series, the N pieces of capacitors in parallel down voltage of 1 / N can be obtained by. Two-phase clock generating circuit 7 22 forms clock becomes a control clock for Suitsuchi you switch connecting these capacitors in series and parallel.

Incidentally, some of all or them in the circuit blocks 8 to 12 in the driving voltage forming circuit 4 is not a charge 'pump circuit, constructed by replacing the known sweep rate Tsu quenching the regulation Jure Isseki utilizing a coil and a capacitor it may be.

3 including a liquid crystal drive voltage waveform, an example of a timing diagram of the liquid crystal display device shown in FIGS. 1 and 2, FIG. 4 is a diagram for explaining a liquid crystal driving voltage waveform example. Figure 3 is 200 rows scan electrode in full screen, it has become only 40 lines of which the display state is the example of a case of displaying a horizontal line at every scanning electrodes one in the region of the table state shown . Between pulses of the frame start signal FRM is one frame period for scanning one screen, its length is set to 20 OH (IH one selection period or one horizontal scanning period).

CA is Fi one field start signal, one frame 50 four fields f 1 ~ one by H: is divided into f 4. Period of de Isseki latch signal LP is 1H, the scanning electrodes of the four rows per click-locking of the signal LP is simultaneously selected. The scanning electrodes in the selected row is applied selection voltage VH or VL, to scan electrodes other row non-selection voltage VC is applied. Y 1~Y40, the waveform of Y41~Y200, shows the scanning voltage waveform applied to the scan electrode 1 to 200 rows. Signal L. 1 to Upsilon in the first clock of the [rho Upsilon 4, 2 clock cycle in Upushiron5~upushiron8, · · ·, scanning electrodes Υ37~Υ40 are sequentially selected in 10 th clock, select the line 40 between 10 Eta but a round. While four rows certain of the line 40 is selected partial display control signal PD is a "Eta" level, 10Ita in 40 lines of selection period PD continues the "Eta" level. At the end the selection of 40 lines [rho D becomes "L" level, the remaining period of one field 50Η 40Η continues the "L" level. Usually, Upsilon driver 2 has a control terminal for fixing the non-selection voltage VC asynchronously by the input of the control signal to all the output. By inputting the partial display control signal PD to such a control terminal of Υ Dora I bus 2, the signal PD is the period of "L" 1 field: the non-display line access period 40H of the of 50 H, 200 lines all the scanning electrodes in a state of being fixed to the non-selection level VC of.

Incidentally, M is switched to the polarity of a liquid crystal AC driving signal, "H" level to the "L" level and the driving voltage applied to the liquid crystal of the pixel (the difference between the scanning voltage and the signal voltage). Also 23

, Xn is only 1 to 40 rows display state, 41-200 row in a non-display state, when viewing a horizontal line at every scanning electrodes one on the portion of the display state is applied to the n-th signal electrode It shows a signal electrode driving waveforms.

Is a repetition of the above operations both fields, selection voltage VH to be applied to the scanning electrodes of the four lines are selected, how give the VL is different in each of the fields f 1 to 4. This is illustrated in Figure 4 A. Selection voltage to be applied to four rows of the scanning electrodes are selected, VH sequentially in the fourth row from the first row in field f 1, VL, VH, is a VH, one row in field f 2 in order from the eye to the fourth line and so VH, VH, VL, called VH. How to combine the selection voltage in each field representing a Co m pattern. Figure 4 A is a 1, the VL VH - shows a represents a matrix equation 1, follow the C om pattern orthonormal matrix with.

Signal voltage is determined by the display pattern and the C om pattern. Scratch on pixel 1, to represent the off pixel display pattern determinant of 4 rows and one column as shown in FIG. 4 B as 1, in each of the fields 1 to F 4, scan electrodes of the n-th signal electrode Xn signal voltage applied to the Y 4 η + ι~Υ4η + 4 row pixels can be expressed by the product of the C om Pas evening over emissions matrix display Pas evening Ichin matrix as shown in FIG. 4 C. Each row of the matrix multiplication is a signal voltage applied to the signal electrode to conform to the pixels of the four lines. For example, according to FIG. 4 C, a signal voltage based on the calculation result of the Fi one field f 1 to the signal electrode Xn (d 1- d 2 + d 3 + d 4) is applied, the field f 2 (d 1 + d 2- d 3 + signal voltage based on the calculation result of d 4) is applied, the field f 3,: f 4 even calculation result to the signal voltage is determined on the basis of FIG. 4 C. Note that in the calculation results, 0 vc, ± 2 is VI, ± 4 means Judges V 2.

Specifically, for example, even if the signal voltage which field because all rows computation result becomes one 2 in the case of full screen on the display (011-4 all _1) - V 1, and the full-screen There off display ((11-14 arithmetic operation result signal voltage because all rows is 2 which field also becomes VI. horizontal line displayed on every other scan electrodes one in all cases 1) (dl = d3 = - 1, d2 = d4 = l calculation result in the case of) the fields f 1 and f 4 is - 2 and the signal voltage since the next one V 1, field 2 and the signal voltage because f 3 becomes 2 in the V 1. 2 4 3, while the selection voltage to the scanning electrodes in the display region is applied, the to the signal electrode X n is selected as the result calculated in accordance with the display pattern as described above driving the dynamic voltage is applied. unfavorable to the fixed child a signal voltage of the non-display line access period 4 0 H to VC. entire field As the contrast of one line 1-4 0 row region that is displayed when the switching between the display state and the partial display state is not changed, the signal voltage at the non-display line access period 4 0 H is the display area in two states This is because the effective voltage applied to the liquid crystal is required to be the same. Therefore, here select the scan electrodes of the last four lines (Y 3 7~Y 4 0) of the display region therebetween of the signal voltage voltage when you are -. and the V 1 thereof or or to continue the signal voltage at the non-display line access period 4 0 Eta is respectively within one Fi Ichiru de is fixed to a constant voltage, but always between the fields not become the same voltage. signal driving voltage electrode X n is a non-display line access period of each field varies as one VI, VI, VI, one VI. Thus, the non-display line access period 4 0 same signal voltage H is between each field Need not be fixed to the pressure, also then change accompanied connexion with the polarity inversion of the predicate bell liquid crystal driving voltage.

M in the liquid crystal AC driving signal, Fig. 3 shows the case of inverting the polarity of liquid crystal driving voltage in each frame. Shin liquid crystal alternating polarity C om pattern of Figure 4 A the level of the drive signal M is above the inverted inversion (1 - 1, 1 - 1 to inversion), and are applied to the scanning electrodes and signal electrodes in response thereto that polarity relative to the VC selection voltage and the signal voltage you inversion. In full-screen display state, the liquid crystal AC driving signal M is inverted every 1 1 H, the polarity of the selection voltage applied to the liquid crystal is inverted every 1 1 H and thereby reducing the occurrence of display crosstalk. On the other hand, in the partial display state, although the polarity inversion driving for each the same period when the same way of the full-screen display (1 1 H) for the display region D, a long period Ri by 1 1 H is in the non-display area, voltage applied to the liquid crystal causes polarity reversal. Partial display region Hiding 示行 access period will be summer long and is small, the display region D and the potential of the signal electrodes and the scanning electrodes for a long period after being driven at a high duty is fixed, the polarity inversion in every frame summer and will, but the results of the experiment, there was no problem in terms of image quality. Also, by the non-display access period the liquid crystal drive voltage is fixed, consumed by the liquid crystal layer and, and Y driver 2 and the X Doraino '3, the charge and discharge current or a through current generated due to the voltage change at the controller 5, etc. since power is significantly less, preferably in terms of power consumption. Power 2-5, as the non-display area is large, by fixing the period of non-display access period is longer connexion scanning voltage and the signal voltage becomes longer, that charging and discharging of the liquid crystal and circuits are low reduction than is suppressed it can.

By the above method, it can be realized partial display function when the 4 MLS driving method. It can be reduced to the point where roughly proportional to the number of lines of power consumption in the partial display state by Hiroshi was method.

Incidentally, the liquid crystal when the display panel 1 is full-screen display state, the control signal PD in always "H" level, de Isseki latch signal LP is being continuously supplied the scan electrode Y 1 to Y 2 0 0 is every four lines are sequentially selected in the 4 line units are simultaneously selected. The polarity inversion of the liquid crystal drive voltage is full-screen display state, it is necessary to carry out at predetermined time intervals. For example by switching the polarity of the selection voltage and the signal voltage for each 1 1 Eta, it is necessary to perform polarity reversal. In addition, frame - and go polarity inversion of the liquid crystal drive electrodes for each beam period, in addition, may be reversed in units Jo Tokoro period within the frame.

Further, in the case of only partial display case and some of the lines of the full-screen display, the time and voltage applied to selection voltage to the scanning electrodes Ru display region near are the same. Accordingly, elements required is added to the driving voltage forming circuit 4 because of the partial display function is not.

Incidentally, in the above embodiment have been described MLS driving method in the case of 4-line simultaneous selection, simultaneous selection line number is not limited to four, so 2 and 7, any simultaneous selection of a plurality of lines if does not matter. Period of 1 Fi one field Different simultaneously selected number of lines also will be different. Also, it has been described that evenly distribute the application of the selection voltages in a frame, if not evenly distributed (e.g., performed in succession the selection of Y 1 to Y 4 to 4 Eta, the Υ 5~Υ 8 select to perform in succession the next 4 Eta, it is also applicable to the method, etc.) to combine the selection in a frame. Further, in the embodiment it was an 4 0 row number partial display lines and 2 0 0 line of full screen, this is not limited, is not limited to this even more partial display locations.

Further, in the above embodiment has been described number of clock of the data latch signal L [rho of each Fi one field as (number of display rows / simultaneously selected number of lines), the number of clocks in consideration of the driver of constraints such as 1 when you add a little before or after the 0 Eta is also included in the scope of the present invention. W

26

(Second Embodiment)

Next, this embodiment will be described with reference to FIGS. 5 and 6. Figure 5 is a circuit diagram showing a portion in the controller 5 in FIG. 1 is a circuit block that controls the partial display state. Also, FIG. 6 is a timing diagram illustrating the operation of the circuit of FIG. 5 is a view enlarged and added to part of the timing diagram of FIG. 3 in the first embodiment. Construction and operation of the liquid crystal display device of the present invention is the same as described in the first embodiment. Therefore, the same parts as the first embodiment will be omitted.

First, the configuration of the circuit of FIG. 14 8 bits about the registry is evening, and the information corresponding to the number of lines to one of the information and the partial display whether parts partial display state is set. By performing the setting of the number of rows in the 7-bit Bok, a line sequential driving one line panel portion displaying 2 7 = 128 Gyoma can be set on a line-by-line basis, 4-row simultaneous selection drive (4MLS driving method) partial display of up to 2 7 X 4 two 512 rows would be set in four rows units in the panel.

15 is a circuit block mainly the evening count, field start signal CA, based on the setting value of de Isseki latch signal LP I such timing signals and Regis evening 14, the timing signal PD and CNT that control the partial display Form. LP I is a signal on which to base the LP, as shown in FIG. 6 is a signal also present a clock having a predetermined period Oite hidden line access period of the PD is "L" level. 16 is an AND gate. The partial display control signal forming Proc 15, as shown in FIG. 6, Fi one field start signal CA, based on the data latch signal LP I and Regis evening set value, first, the signal CNT for 1H precedes the partial display control signal PD Form. In the circuit block 15, for example, such as by switching the level of the CNT by coincidence detection between the value obtained that row by setting values ​​of the counter evening and Regis evening 14 for counting the number of lines by entering the LP I, form a CNT it can be formed. AND output of the CNT and the LP I is LP. PD is formed by 1 H delayed CNT in LP I. C NT in full-screen display state is a constantly "H" level, and remains the AND gate 16 is opened, the same signal is fed directly and LPI on LP. Thus, all the scanning electrodes 200 rows of gradually been made, in units of lines of a predetermined number.

For a partial view, in accordance with the set value of the shift Torejisu evening 14, the PD indicating a partial display period in 1 Fi one field period, to 27 Ru to "H" level in the period specified by the setting value. In CNT having "H" level of a length corresponding to the PD is at the "H" level period, by controlling the output of the LP, the data latch signal LP is output only for the duration of a CNT is "H" so as to.

By the above method, the value corresponding to the number of rows partial display to set the register evening 14 of the control circuit, the number of rows in the partial display according to the setting value is possible Rukoto is changed by adjustment of the PD (CNT) Become. Upon realizing the partial display function, because necessary to provide a means for a hard-constraints such changes modifications and Baia scan ratio and selection voltage LP period it was not, as Regis evening number preferred partial display row user can software to set Do setting means, a liquid crystal display device having a high partial display function versatile.

In the above in the example has been described about the case of displaying portion from the top of the panel by a predetermined number of rows, the start and end lines of the partial display area by two series prepared evening Regis setting means each register evening by setting the value corresponding to the position of the partial display area in addition to the number of rows can be made variable. In this case, the circuit block 15, the CNT by coincidence by comparing the start line is set to evening count value and the first register of the evening counter described above is "H", the counter evening count and the second register evening a match by comparing the end line which is set to control so as to "L" CNT.

(Third Embodiment)

This embodiment is an example when only that the potential of the signal electrodes in the non-display line access period are fixed at the same level as for the full-screen OFF-display is different from the first embodiment. 4 that employs the driving voltage forming circuit 4 shown in FIG. 2 mainly composed of 4MLS driving method and the charge pump circuit of the selection voltage evenly distributed by Com pattern A, the scan electrodes in the whole screen is 200 lines There, a point only 40 lines of which are summer and display status, points Ru example der when viewing a horizontal line at every scanning electrodes one on the portion of the display state, the length of one frame period 200 point is H, that secures the voltage applied to the scanning electrodes in the non-display line access period in the non-selection voltage VC, is that it inverts the polarity of the liquid crystal drive voltage for each one frame existed first is the same as that of the embodiment. Therefore, the first embodiment forms on purpose same portion of will be omitted.

7 is shows a timing diagram in this embodiment, the FIG. 3 described in the first embodiment by a voltage waveform applied to the signal electrode Xn is different. Scanning electrodes 2 8

Since the voltage waveform applied to the Y 1 to Y 2 0 0 is the same as FIG. 3, according to FIG. 7 is omitted.

In this embodiment, potentials applied to the signal electrode chi eta (4 0 Period of Η in each field ί ") non-display line access period is fixed at the same level soil V 1 in the case of the full-screen OFF-display are other words, the signal voltage at the non-display line access period, the liquid crystal AC driving signal Μ is fixed to V 1 was when the "L", when Μ is "Eta" is -. be fixed to V 1 , it is inverted for each one frame.

The effective voltage applied to the liquid crystal of the display area by this method, can be the same between the case when the partial display state of the full-screen display state, the display area when a switch between two states of the full-screen display and the partial display Ru can be so that the contrast does not change. Fixing the signal voltage at the non-display line access period at the same voltage as the case of full-screen OFF-display is possible only to add slight changes to the X driver 3. For one example of the method will be explained in the sixth embodiment.

The signal voltage at the non-display line access period, that it to continue the voltage when you select the last four lines of the scanning electrodes in the display region as in the first embodiment (Υ 3 7~Υ 4 0) than methods, preferred in terms of better methods of the same level as the signal voltage in the case of full-screen oFF-display or full screen on the display as in this embodiment can and this to suppress the occurrence of flicker scratch.

The reason for this is as follows. Display patterns of the last four lines of the partial display area, if three rows remaining one line in the ON-display is off the display, or it and when the remaining one line on the display in the reverse three rows off display in the first embodiment, this field is the VC next of signal voltage is 4 fields, serving as an V 2 or V 2 in accordance with the number on line of the last four lines of the remaining one field partial display area . Thus, 3 field VC next of the non-display line access period signal voltage 4 Fi one field of the remaining 1 Fi one field in response to the number on the line in the last four lines of the partial display area - V 2 or the V 2.

On the other hand, in the case of the present embodiment, as described above, in accordance with four fields in Μ liquid crystal AC driving signal, -VI (signal electrode voltage for all the pixels on the display) or VI (all pixel O off display of the signal the electrode voltage). Voltage of Judges V 2 of the first embodiment is easy to liquid crystal response as large as 2 times the Judges VI, it becomes a cause of flicker. Therefore, the signal voltage at the non-display line 29 access period, it be the same voltage as in the full-screen OFF-display or full screen on the display is preferably in terms of image quality.

(Fourth Embodiment)

Here we describe an example in the case of performing partial display with SA (Smart-Addressing) driving method. Structure of the liquid crystal display device is similar to FIG. 1 described above, SA The driving dynamic method, in FIG. 20 showing the conventional driving voltage waveforms, for example, a liquid crystal AC driving signal M is a period of "H" the drive potential is lowered by overall (V 1 -V4) is a driving method in which the non-selected voltage on one level, the scanning electrodes are selected one by one line like the drive conventional. First, it will be described with reference to FIG. 8 which is a block diagram an example of a driving voltage forming circuit for SA driving corresponding to the block 4 of Figure 1.

Non-selection voltage VC as well as the scan signal voltage and MLS driving method in SA driving method, the positive selection voltage VH, requires three voltage levels of the negative-side selection voltage VL. Here, VH and VL are symmetrical about the VC. VH if the SA driving method is considerably higher voltage than VH in the case of the MLS driving method. The signal voltage requires two voltage levels of the soil VX, these voltages are also symmetrical about the VC. Circuit of Figure 8 is an input supply voltage (V c c-GND), and outputs a voltage higher than the de Isseki latch signal LP as a clock source for Chiya temporary pump circuit. Hereinafter, unless otherwise stated, the GND and standards (0V), described as Vc c = 3 V.

Each one VX and VX signal voltage used GND and Vc c as it is. Block 1 7 is a step-up / step-down clock forming circuit to form a two-phase clock having a narrow time interval for operating the charge 'pump circuits 18-20 from the input signal LP. Block 19 is a 1/2 step-down circuit to form a voltage obtained by stepping down the input supply voltage Vc c to 1/2 VC = 1. 5 V. Block 18 is the negative direction 8 times boosting circuit, VEE = is 8 times the voltage of the input power supply voltage in the negative direction relative to Vc c as an input power supply voltage (Vc c-GND) - to form a 2 IV. Block 21 Ru contrast adjustment circuit der for extracting necessary negative-side selection voltage VL (for example one 17 V) from VEE. Block 20 is the double boosting circuit for forming the positive selection voltage VH, (VC- VL) is twice the voltage of the positive input voltage on the basis of the VL as input voltage VH (was example if 20 V ) to form. Voltage can be formed need to SA driving at 30 or more. Block 18-20 is up / step-down circuit Chiya over di-pump method either. The charge pump circuit is constituted by series-parallel Suitsuchingu the plurality of capacitors using a 2-phase clocks, as described above. Drive voltage generating circuit according to the step-up / step-down circuit such charge pump method has a high power supply efficiency, it is possible to drive the liquid crystal display device according to SA driving method with low power consumption.

Figure 9 is an example of inclusive timing diagram of the liquid crystal driving voltage waveform, there 200 rows scan electrode in full screen, only 40 lines of which has a display state, scan electrodes 1 run to a portion of the display state every present an example of a case of displaying a horizontal line.

The length of one frame period is set to 200 H. Period of the data latch signal LP is 1H, the scanning electrodes of one row every one clock of LP are sequentially selected. The scanning electrodes in the selected row is applied selection voltage VH or VL, to scan electrodes other row non-selection voltage VC is applied. Y 1~Y40, the waveform of Upushiron41~upushiron200, shows the scanning voltage waveform applied to the scan electrodes of one to 200 lines. Y 1 in the first clock of the LP, 2 clock cycle in Y 2, · · ·, is 40 selected clock cycle at Y40 scan electrodes are sequentially 40 selects the line 40 between the H takes a round. While this line 40 is selected partial display control signal PD continues the "H" level. When the end of the selection of 40 lines PD becomes the "L" level, the rest of the period 160H will continue to "L" level. Usually, Y driver 2 has a control terminal to fix the total output asynchronously to the non-selection voltage VC. By entering the PD to such a control terminal of the Y driver 2, the non-display line access period 160H PD is that Do the period of "L" is in a state of all the scanning electrodes are fixed at non-selection level.

Incidentally, M is switched to the polarity of a liquid crystal AC driving signal, "H" level to the "L" level and the driving voltage applied to the liquid crystal of the pixel (the difference between the scanning voltage and the signal voltage). Furthermore, X n is only 1 to 40 rows display state, in 41-200 row non-display state, when viewing a horizontal line at every scanning electrodes one on the portion of the display state, the n-th signal electrode It shows the application to the signal electrode driving waveforms.

Further, FIG. 9 shows an example in which the polarity inversion of the liquid crystal driving voltage is inverted for each frame. VH when the selection voltage applied to the scanning electrode liquid crystal AC driving signal M is "L", "H 3 1

"When is a VL signal voltage is." "A VX in the ON pixels when a VX in off pixels, M is" L VX in the ON pixels H ", the is off pixels - with VX there. as mentioned in the previous embodiment, if less the number of lines to partially show area is greater, the signal a relatively long non-display-line access period after the display region is driven at a high duty electrode and the potential of the scan electrodes is fixed, the polarity inversion want turned every frame UGA, the result of the experiment, the image quality surface had no problem. Further, the liquid crystal drive voltage is fixed to the non-display access period Accordingly, the liquid crystal layer and, and Y driver 2 and the X driver 3, the power consumption is greatly reduced due to the charge and discharge current or a through current generated due to voltage change in the controller 5 or the like, preferably in terms of low power consumption . power consumption, non-display Region is larger, by fixing the period of non-display access period is longer connexion scanning voltage and the signal voltage is increased, it is possible to charge and discharge of the liquid crystal and circuits are reduced than suppressed.

Voltage applied to the signal electrode X n non display line access period is directly allowed to continue voltage (in FIG. 9 VX) of when selecting the scan electrodes in the last line of the display region (Y 4 0) . Signal voltages in the non-display line access period is fixed at a constant voltage within one frame, but each frame has changed over to the VX As an VX. Thus, the signal voltage at the non-display line access period need not be the same voltage between each frame. In this was bovine method, when switching between full-screen display state and the partial display state, so does not change the contrast of a region that is displayed, the signal voltage at the non-display line access period, based on the non-selection voltage VC by repeating alternately at two potentials which are symmetrical, it is possible to effective voltage applied to the liquid crystal of the display area is fixed to a voltage which is the same. In this embodiment VX and - because VX is equivalent to the signal electrode voltage for displaying the entire OFF-display or the entire surface on the display, similarly to the embodiment described above, the signal electrodes in the non-display line access period the electric potential of which is configured to be fixed at the same level as for the entire O emissions displayed or entirely off the display.

It may be used the same circuit as FIG. 5 for the formation of the signal PD and LP. Timing diagram for this case may be added to the following changes in FIG. That is, 0 eight to 1 ^, the length of fn to one frame period (2 0 0 H), the number of clock of LPI in one frame period 2 0 0, LPI periods of CNT is "H" 2 by 0 0 clock's falling edge or 3 2 et 4 0 clock's falling edge of the clock of the LP from LPI 1 clock cycle to 4 0-th clock, PD is at the "H" period LPI 1 clock of the falling or et al. 4 may be changed to up to 1 clock's falling edge.

By the above method, the partial display function when the SA driving method can be realized. It can be reduced to the point where roughly proportional to the number of display lines of power consumption in the partial display state by such ways.

The control signal PD is in full screen display state in always "H", LP is the is continuously fed Y 1 ~Y 2 0 0 are sequentially selected. The polarity inversion of the liquid crystal drive voltage is full-screen display state, it is necessary to carry out at predetermined time intervals. For example by switching the polarity of the selection voltage and signal voltage for every 1 3 Eta, it is necessary to perform a polarity reversal. In addition, or perform polarity inversion of the liquid crystal drive electrodes every frame period, in addition, may be extremely I 1 raw inverted every predetermined period in a frame.

In the case of only partial display case and some of the lines of the full-screen display, the time and voltage applied to selection voltage to the scanning electrodes Ru display region near are the same. Therefore, the elements required is added to the driving voltage forming circuit for the partial display function without it is possible to soft manner to set the number of lines to parts displayed using a circuit as shown in FIG.

(Fifth Embodiment)

This embodiment is that the timing of the liquid crystal AC driving signal Μ the period in which the selection voltage to the display line is applied is the same in the case of only partial display case and some of the lines of the whole screen display the 4 embodiment as an example where different. That employs a driving voltage forming circuit 4 shown in FIG. 8 consisting mainly of SA driving method and the charge pump circuit, there 2 0 0 row scanning electrodes in full screen, only 4 0 line of which has a display state, a point every one scanning electrode to the portion of the display state is an example of the case of displaying a horizontal line, a point the length of one frame period is 2 0 0 Eta, hidden line It is fixed voltages applied to the scanning electrodes of the access period to the non-selection voltage VC selection, that are fixed in symmetrical VX or single VX a voltage applied to the signal electrodes with respect to VC, applied to the scan electrodes voltage is VL when of VH, M = "H" when Doshingo M = "L" driving the liquid crystal AC, in the oN pixels when the signal voltage is M = "L" - VX, in the off pixel VX , and the case of M two "H" is in the on-image-containing VX, is off pixel point is an VX is the same as that of the fourth embodiment. Other 3 3 Me, not described for the same parts in the fourth embodiment.

Figure 1 0 is shows a timing diagram in this embodiment, by switching the polarity of liquid crystal driving voltage every 1 3 H (selection period of 1 three lines of the scanning electrodes). Thus the period of the liquid crystal AC driving signal M becomes 2 6 H. Since 2 0 0 H can not be divided by 2 6 H, timing of the liquid crystal AC driving signal M for the frame start signal FRM went shifted by 8 H per frame, FIG. 1 0 and round with 1 3 frames Ru back to the beginning of the timing.

To form the signal M of a constant cycle in the partial display state, the continuous clock signal LPI shown in FIGS. 5 and 6 that underlies the LP after dividing the period of the half, the additional 1/2 it is sufficient to division. But in the case of full-screen are shown, it is assumed that switching the polarity of the liquid crystal drive voltage for each Likewise 1 3 H. In this manner, the timing of the polarity inversion of the voltage applied to the liquid crystal of the portion that is displayed in the partial display state can be the same as for the full-screen display state.

By doing so, it is possible to make the image quality of the portion displayed in the partial display state to the same as for the full-screen display state. Incidentally, the formation of the liquid crystal AC driving signal M, in the case of using LP rather continuous clock signal LPI, in relation to the polarity inversion cycle and the partial number of lines of the driving voltage, flicker may occur in the partial display state there is the image quality and direct current voltage is applied to deteriorate.

(Sixth Embodiment)

Figure 1 1 is an example of a partial block diagram of a signal electrode driving circuit in FIG. 1 (X driver 3). 4 corresponds to the MLS driving method, the number of liquid crystal drive output terminal as one example was 1 6 0. It will be described the workings of the construction and the blocks 1 1 below.

Block 2 5 is R AM for storing Isseki display de, binary display (display of only gradation display is not ON / OFF) with 2 4-bit number that can correspond to the liquid crystal display panel of up to row 0 (1 6 0 x 2 4 0 is composed of number of pixels). Block 2 2 is a circuit for generating a signal for precharging R AM 2 5 in accordance with the de Isseki latch signal LP. Proc 2 3 is a row Adoresu generating circuit for designating whether reading the display data of which four rows from the R AM 2 5, 4 where the addresses are sequentially designated in response to the frame start signal FRM and the data latch signal LP is simultaneously selected corresponding to the scanning electrode lines, four lines depending on the LP X 1 6 34

0 column of so as to collectively outputs display de Isseki pixel, sequentially fin increment the Adoresu of four rows.

Line Adoresu display data of four rows specified by generator 23 Isseki is being Desa read from R AM 25, sent to the read display de Isseki control circuitry of the configured block 26 in an AND gate. Although the partial display control signal PD is at the "H" level period are the same contents as the display data is sent to the next block 27 via the block 26, 卩 0 is "1, duration of level display data of the RAM Isseki data for ignored by all the pixels off (0) is sent to the block 27. here, PD is at the "L" level period, all the pixels on the display of the de Isseki the (1) block 27 to enter into, it is also possible to change the block 26 o

Block 24 is a circuit for generating a good UNA C om pattern of Figure 4A in accordance with the polarity of the frame or field and the liquid crystal drive voltage, C om pattern is stored in the ROM or the like, it is a frame start signal FRM, the field start signal CA, are addressed by the liquid crystal AC driving signal M, etc. (pattern is inversion / non-inversion in accordance with the level of M) C om pattern corresponding to the polarity of the liquid crystal drive voltage is selectively outputted. Proc 27 is ML S decoder for the X driver that form a driving voltage selection signals from the display de Isseki of four rows via Co m pattern and the block 26. From ML S decoder 27, the drive voltage selection signal 160 pixels five per pixel is output. Drive voltage selection signal is a set of signals at five to instruct VC, soil VI, the choice of which voltage of five voltage Judges V2. D 0 n is a display control signal for the non-display state to the full screen, only the signal for instructing the selection of the VC of the five selection signals when the "L" level to Don becomes active. When Don becomes "H" level, based on the display data and the C om pattern to be displayed on pixels of four rows in the column direction, signal voltage determined according to the determinant in Fig. 4 C is selected from among five voltage that.

Block 28 is a level shift evening to expand the voltage amplitude of the drive voltage selection signal to the logic voltage (Vc c- GND) from the liquid crystal driving voltage level (V2- [one V2]). Flop lock 29 VC, soil VI, a voltage selector for selecting actually one voltage from the five voltages of Judges V 2, connected to the supply line of the five voltage by the drive voltage selection signal whose voltage amplitude level has been amplified are closed either Suitsuchi the three respective signal electrodes the selected voltage 5

And outputs it to the X 1~X 1 6 0. The above is the work of construction and the proc of Purodzuku diagram of Figure 1 1.

In the non-display line Adoresu period partial display state, if the input to the LP terminal of the X driver 3 of this embodiment stops the clock of the LP signal as shown in FIG. 3, during which the block 2 and second pre-charge signal stop the line Adoresu generation circuit of generating circuit and proc 2 3, that is, it is possible to stop the read operation of the R AM 2 5. At this time, Gyoa dress generating circuit 2 3 Since LP is not input Adoresu is not Inkurimento, R AM 2 5 continues to output the Isseki display data of the last four lines of the display area.

Therefore, when excluding the block 2 6, like the first embodiment, the signal voltage of the non-display Gyoa access period, the voltage of when selecting the last four lines of the scanning electrodes in the display region it will be continued. However, as shown in FIG. 1 1, the that there is a block 2 6, by entering the hidden line access period "L" and becomes signal PD as shown in FIG. 3 to PD terminal of the X driver 3, the fourth as in the embodiment, the signal voltage at the non-display line access period will keep the same voltage as the signal voltage in the case of full-screen oFF-display or full screen O emissions display (V 1 or one VI).

R AM built-in driver that stores data to be displayed on the entire screen is used because it is effective for reducing power consumption of the liquid crystal display device. In the selection voltage evenly distributed MLS driving method, such as described in the first embodiment, it was the R AM embedded driver becomes easy configuration of the liquid crystal display device. These Reasons liquid crystal display device aimed at both quality improvement and lower power consumption from, R AM built-drivers corresponding to the MLS driving method has begun to be adopted. In such liquid crystal display device, the power due to the pre-charge (refresh) operation when reading the display data from the R AM consumption is a significant part of the total power consumption. Therefore, the power consumption to pursue by partial display function, it is necessary to stop the R AM read operation that put in the non-display line access period by using the X driver such as in the present embodiment.

Have been described MLS driving method in the case of 4-line simultaneous selection in the above embodiment, simultaneous selection line number is not limited to four, but may be two or 7 and so on. Also, have been described that evenly distribute the application of the selection voltage in one frame, it is also applicable to the case of not evenly distributed (if 36 consecutive frames within the selected period for one scanning electrode). Although V 2 terminal and VC terminal in FIG. 1 1 is made independent and Vc c and GND in the logic portion power supply voltage terminal, it may be not necessary to separate. Also, if the display data RAM, a liquid crystal display device capable of gradation display, not binary display has a storage capacity corresponding to the number of gradation bits or screen with an internal display data RAM multiple screens in the case of the liquid crystal display device capable of performing a switching display can also be applied to the present invention.

(Seventh Embodiment)

Figure 12 is an example of a block diagram of scan electrode driving circuit of the present invention in FIG. 1 (Y driver 2), corresponds to the sixth embodiment similarly to 4 MLS driving method. Was 240 liquid crystal to drive the number of dynamic output terminal as an example. Hereinafter, the-out structure and work of each block in FIG. 12 will be described.

Proc 32 is a Shift register evening for transferring de Isseki latch signal LP one by one bit Ficoll one field start signal CA as a clock. In which four rows of the 240 rows consists 60 bits to specify whether to apply the selection voltage. Block 30 is the initial setting signal generating circuit sets the first bit of the Shift register evening 32 to 1 at the fall timing of the data latch signal LP when the frame start signal FRM and the field start signal CA is at the "H" level, the remaining the 59-bit to generate a signal for clearing to 0. Block 31, like the Com pattern generating circuit 24 of FIG. 1 1 is a circuit that generates a C om pattern in accordance with the field and the liquid crystal drive voltage polarity, C om pattern is stored in the ROM or the like, it is a frame start signal FRM, the field start signal CA, are addressed by the liquid crystal AC driving signal M such, Com patterns corresponding to polarity of the liquid crystal drive voltage is selectively outputted. X driver 3 and the Y driver 2 of C om Pas evening Ichin generating circuits are may simultaneously serve. Purodzuku 33 is ML S decoder for Y driver for forming a three driving voltage selection signals from the 60-bit in the selected row information and C om pattern specified by the Shift register evening 32. From ML S decoder 33, the drive voltage selection signal 240 rows of three with respect to one line is output. Drive voltage selection signal is a set of signals in three instructing VH, VC, and the choice of voltages of three voltage VL.

Don denotes a display control signal for the non-display state to the full screen, only the signal for instructing the selection of the VC of the three selection signals when the "L" level D on is Akutibu 3 7. 0 0 When 11 becomes "11" level, the scan signal voltage determined in accordance with the matrix of basis Figure 4 A to the selected row and C om pattern is selected from three voltages.

Block 3 4 is a level shift evening to expand the voltage amplitude of the drive voltage selection signals from a logic voltage (V cc- GND) to (VH- VL). Block 35 is a voltage selector for selecting VH, VC, actually one voltage from the three voltages of VL. Close either voltage connected sweep rate Tutsi to a supply line of the three voltage by the drive voltage selection signal amplitude level is amplified, and outputs the selected voltage to the scan electrodes Y 1~Y 2 4 0. Than on it is working configuration and the proc of proc view of FIG 2.

In the non-display line Adoresu period partial display state, if the input to the L [rho terminal of Υ Doraino 2 of the present embodiment the clock has been de Isseki Radzuchi signal L [rho stop as in FIG. 3, during the Shift register evening 3 2 operate can be stopped. Although Υ power consumption of the driver 2 is relatively small, thus it is preferable to stop the Shift register evening 3 second operation in the non-display line address period in the partial display state to pursue low power consumption. The provided initial setting signal generation circuit of the block 3 0 is to prevent the abnormal display of the timing to shift to full-screen Display state from the partial display state. In the partial display state when the block 3 0 no, for example, every 1 0 bit Shift register evening 3 2 when operating at the timing of FIG. 3 or FIG. 7 "Eta" level Ru written. Although no problem because bits after the 1 0-bit by the signal PD is ignored in case of connexion also partial display state, 4 rows per 4 0 rows when the transition to full-screen display state from this state, the entire screen in 2 0 0 2 0 row selection voltage of the line is simultaneously applied have want, so that the instantaneous abnormal display occurs. Incidentally, PD instead of providing the block 3 0 by adding an initialization circuit for clearing the Shift register evening 3 2 when "L", the partial display state when a transition to a full-screen display state Shift register evenings 3 in 2 bits may be set to be the initial state. Thus, the Shift register evening 3 2, there is a need for a means to initialize the evening Shift register upon transition from the partial display state to the full-screen display state.

(Eighth Embodiment)

Figure 1 3 is an example of a circuit diagram of the contrast adjustment circuit 1 3 of the present invention in FIG. 2 and FIG. Here, RV is a variable resistor, Q b is bipolar 'transistors, Q n is the n Chi 38 Yaneru M_〇_S transistor. Signal PDH that is input to the gate of the Qn is an enlarged signal voltage amplitude of the signal PD from the logic voltage (Vcc- GND) by level shifting the evening to (V cc-VEE). The resistance of the on state of the transistor Qn is assumed negligibly small compared to the resistance value of RV. In the figure, even field - V2 one 3V, £ is _ 15 ¥, ¥ is -10 ¥ Dearu.

Transistor Qn is the contrast adjustment circuit section in Fig. 16 and based on this the same as a conventional example Without. Full screen PDH is always in a state "H" level, i.e., Q n is always on, the presence of Qn functions similarly to the contrast adjustment circuit in the conventional example are negligible in resistance manner. The variable resistance - between V2 and VE E is divided voltage is removed is supplied to the base of the Qb, a 0. 5 V before and after a voltage higher than the voltage supplied to the Qb Habe Ichisu from Emitsu evening one supplied as VL. Selection voltage VL becomes optimum contrast by adjusting the variable resistor RV is obtained. Partial display state your have PDH be the "H" level period, namely, the period that has selected voltage is applied to the display line is the same.

PDH is at the "L" level period of the partial display state, i.e., non-display line Akuse scan period Qn the function of the contrast adjustment circuit 13 is turned off to stop. This period is the base and collector of Qb is made as one V2 and the same potential, Qb be completely turned off. This period the charge pump circuit of the driving voltage forming circuit 4 is an operation stop state, since the stop also applied in the selection voltage, the current consumption of the VL system is 0, Qb is also turned off the VL voltage is no problem because it is held. By stopping the Contrast adjustment circuit 4 in such a non-display line access period, the power consumption during this period due to the contrast adjustment circuit to be 0, it is possible to reduce the power consumption of the liquid crystal display device. In the above embodiment describes an example that requires signal PDH that level-shifting the PD, but if devising a configuration of a drive voltage generating circuit, instead of the level shifted signal PDH, directly to the partial display control signal PD it is also a child stops contrast adjustment circuit using. According to the first to eighth embodiments, without having to go to complicating the driving voltage forming circuit, and the partial display row number and position can be set by software versatile electric light 3 9 it is possible to provide an academic device. Further, it is possible to provide an electro-optical device significantly reduces power consumption during the partial display.

In the above respective embodiments, or fixing the signal voltage in the non-display line access period in one full I one field, although or fixed to shorter than one frame prescribed period, full-screen display state It can reduce power consumption if it is tied to at least longer than (half period of the polarity inversion driving cycle) driving period of the same polarity in the polarity inversion driving cycle of the liquid crystal drive time of, in this case, the non-display line access may be so as to invert the signal voltage when the full screen on the display and the oFF-display in accordance with the predetermined cycle during the period. For example, the polarity inversion of the liquid crystal drive on the full screen display state, the polarity inversion driving cycle from being performed for each 1 1 H or 1 3 H in a simple matrix type liquid crystal display device shown in the above embodiment 2 2 is H or 2 6 H, the polarity inversion drive kinematic cycle because polarity inverted every § active matrix liquid crystal display device 1 H or dot period Te smell to be described later (d 1 H / number of horizontal pixels) 2 H or the two dots period. Polarity inversion driving cycle of the liquid crystal driving of the non-display area in the partial display state is longer than the period of these full-screen display state, a period longer than at least 1 1 H or 1 3 H a simple Matrix scan type liquid crystal display device the applied voltage is fixed, if the applied voltage fixed more have long duration of at least 1 H or dot period in § active matrix liquid crystal display device, a low power consumption drive frequency Te summer low.

Incidentally, the first to eighth embodiments according to the above description has been given assuming simple matrix type liquid crystal display device, an electro-optic such as Akutibu type liquid crystal display device having a two-terminal type nonlinear element in pixels it is also possible to apply the present invention apparatus. 2 2 is a diagram showing an equivalent circuit diagram of § Kuti flop matrix liquid crystal display device 1 such as this, 1 1 2 scanning electrodes, 1 1 3 signal electrodes, 1 1 6 pixels, 3 X Doraino ^ 2 respectively indicate a Y Dora I bus. Each pixel 1 1 6 is formed from the scanning electrode 1 1 2 and a two-terminal nonlinear element electrically connected in series between the signal electrodes 1 1 3 1 1 5 and the liquid crystal layer 1 1 4. Two-terminal non-linear device 1 1 5, the order of connection of the liquid crystal layer 1 1 4 is may be reversed and drawing, as a thin film Daiodo be set to Re Izu in accordance with the voltage applied between the two terminals current characteristics is used as Suitsuchingu element using to have nonlinearity. The structure of the liquid crystal display panel, and one on a substrate two-terminal nonlinear element and the pixel electrode, while the the formation of the scanning or signal electrodes, wide so as to overlap with the pixel electrodes on the other substrate, the scanning or 4 to form the other 0 signal electrodes, formed by sandwiching a liquid crystal layer between a pair of substrates. In such § active matrix type liquid crystal display panel, by a similar drive how each of the above embodiments, it is possible to perform the partial display. In the case of an active matrix type liquid crystal display display panel, since the driving method of holding the voltage by placing Suitsuchingu element in each pixel, when shifting the partial display state from the full-screen display state, as described below , it is preferable to migrate the partial display state after writing the pixel off display voltage to the non-display area during the migration.

(Ninth Embodiment)

This embodiment is for realizing a display without discomfort in the partial display state. Figure 1 4 is a diagram for explaining the partial display state in the liquid crystal display device of the present invention. 1 is a liquid crystal display panel Roh one Mali one white preparative, for example, those capable of displaying 2 4 0 row X 3 2 0 columns of pixels (dots). Although if necessary can be Rukoto the display state full screen, and the display state portions in the entire screen (e.g. only the upper 4 0 lines as in Figure 1 4) (display region D) in the standby state, the remaining it can be a region on the non-display state (non-display region). Because Bruno is one Marie white door type, the non-display area is that Do and white display.

Structure of the liquid crystal display panel is a similar to the embodiment of the first to eighth, sandwiching a liquid crystal between a pair of substrates has an electrode applying a voltage to the liquid crystal layer in the substrate inner surface, an outer surface of the substrate formed by arranging a polarizing element as needed to the side. Setting of the transmission axis of the polarizing element may vary depending on the liquid crystal of the kind, the effective voltage applied to the liquid crystal as well known is performed so that a white display is lower than the threshold voltage of the liquid crystal. As the polarizing element, may if polarizing element which transmits light having a specific polarization axis as evening for example a beam splitter is not limited to the polarizing plate. Liquid crystal, the type in which the liquid crystal molecules are twisted (TN type, STN type, etc.), the type oriented Homeoto port pick, the type and the vertically oriented, such as a memory one type of such ferroelectric, can be variously used. Further, it also liquid crystal light scattering as polymer-dispersed liquid crystal, in which case the orientation of the liquid crystal molecules without the polarizing element is set to be one white preparative normally. Furthermore, in the case when equal to or greater than the contrast of the liquid crystal display panel one black type normally is required, on one of the inner surfaces of the pair of substrates de 4 1 Tsu light shielding layer intercluster (the openings of the adjacent pixels shielding frame) may be provided between.

Further, in the case of the liquid crystal display panel 1 in the reflective type, placing the reflector on the outer side of one substrate, or to form a reflective electrode or reflective layer on one of the inner surface of the substrate, disposing a reflective member such as a configuration, by setting the transmission axis of orientation axis and Henkomoto terminal of the liquid crystal molecules so as to reflect incident light in the above reflection member when the effective voltage applied to the liquid crystal and below low off than the threshold voltage good. In the case of the liquid crystal display panel using a STN liquid crystal, because it is often arranged a phase difference plate between the polarizing element, in which case the transmission axis in consideration of the phase difference plate is set. When the semi-transmission type, a liquid crystal display panel you Lighting device, at the time of lighting of the lighting device using the liquid crystal display panel 1 as a transmission type, at the time of non-lighting of the lighting device is used as a reflection type. Configuration for the semi-transmissive is are various, the outside of one of the substrates, the semi-transparent plate or place, the light transmitted through the same polarization axis component substantially orthogonal light of a predetermined polarization axis component how to or place a reflective polarizer that reflects and, a method of a structure in which the semi-transmissive light electrodes formed on one substrate inner surface (for example, opening the holes) can be considered.

Further, in the case of a color of the liquid crystal display panel 1 in the case of the reflective type or transflective type, to form a color filter evening on board the inner surface, or in the case of semi-transmissive, three colors you emitting lighting device when switched in series, it can be considered a method such as.

In the liquid crystal display panel 1 is partial display state, to apply a liquid crystal set lower than the threshold voltage is programmed off voltage or lower of the effective voltage of the non-display region. Since the liquid crystal display panel 1 as described above is a normally white type, whereby the non-display region is a I Unishiro display shown, corresponding to the display content display region a white display on the background in the D since the image of the halftone display and black display appears, and no partial display screen incongruity.

As the structure of the liquid crystal display panel 1 in addition to the above structure, and an active matrix type liquid crystal display panel arranged two-terminal nonlinear element as described in Figure 2 2 pixels, as shown in FIG. 2 3, both the scanning electrodes and the signal electrodes on one substrate is made form a matrix, but may be an active matrix type liquid crystal display panel in which a transistor is formed for each pixel.

The method of applying the liquid crystal to the off-voltage following the effective voltage of the non-display area will be described below. It shows a configuration example of a liquid crystal display device according to the present invention in FIG 5. 1 is a liquid crystal display panel Roh one Marie white preparative, a substrate having a substrate and a plurality of signal electrodes forming a plurality of scan electrodes formed 4 2 are disposed opposite at a distance of a few 〃 m, the gap the liquid crystal as exemplified above is sealed, the liquid crystal picture element (dot) arranged in a matrix in accordance with intersections of the scanning electrodes and signal electrodes, and applying an electric field corresponding to the display de Isseki It is forming a display screen. 2 4 0 row X 3 2 0 column dots can be displayed on the full screen as an example, for example, a region 4 0 row X 1 6 0 row of the top left Ru hatched portion D is displaying portion, and the other region and things that are hidden state. The scanning electrodes during the selection period a selection voltage is applied, is applied to the liquid crystal of the intersection (the intermediate voltage, if necessary) the signal electrode to the applied ON voltage or OFF voltage crossing the scan electrodes , changes in turn-on voltage and turn-off voltage oriented state of the liquid crystal molecules of the part is applied, thereby display is performed. Note that the scan electrodes during the non-selection period non-selection voltage is applied.

Next, Proc 2 is a Y driver that selectively applies a selection voltage or non-selection voltage to the plurality of scan electrodes, the block 3 is the signal voltage (on-voltage Ya O off voltage corresponding to the display data D n, more an X driver for applying an intermediate voltage) to the signal electrode. Drive voltage generating circuit block 4 forms plural voltage levels necessary for driving the liquid crystal, supplying the plurality of voltage levels to the X driver 3 and the Y driver 2. Each driver selects a predetermined voltage level in response to evening out of the voltage level supplied Imingu signal and display de Isseki, it applied to the signal electrodes and the scanning electrodes of the liquid crystal display panel 1. Proc 5 it these circuits necessary timing signals to CLY, F RM, CLX, an LCD controller that forms the LP, display data D n and the control signal PD, the system bus of an electronic device that includes the liquid crystal display device It is connected to the. Block 6 In the outside of the liquid crystal display device, a power source that powers the present liquid crystal display device.

Circuit proc of the liquid crystal display panel in the present embodiment described above is substantially the same as the first to eighth embodiments, particularly when using a simple matrix type liquid crystal display panel, the implementation of the first to eighth the same driving method and embodiment, it is possible to perform partial display. In the following description of the driving method, and the use of the driving method of selecting the scan electrodes run in each line as described in FIG. 9 and FIG. 1 0 As an example, described in the above embodiments it may be simultaneous selection of a plurality of lines by MLS driving method as.

Figure 1 6 is an example of a timing diagram in the partial display state of the liquid crystal display device of FIG. 1 5, directed to a liquid crystal display panel of simple matrix type. D n is a display data transferred from the controller one La 5 to the X driver 3, there is shown a period 43 in which the display de Isseki is transferred shaded block. The display de Isseki Dn for one display line (scanning electrode) fraction in the portion of the shaded block, to high-speed transfer from the controller 5 to the X driver 3. CLX is Kurodzu click for the transfer of control transfer to the X driver 3 displays de Isseki Dn from the controller 5. X driver 3 has a built-in evening Shift register operates the evening sheet Futorejisu in synchronization with the clock CLX, are sequentially temporarily fetches display data Dn for one display rows on the Shift register evening or a latch circuit. If X driver 3 in RAM within built as shown in FIG. 11 the driver, display de Isseki Dn is stored in the RAM 25.

Next, LP denotes a data latch signal for latch to the next latch of the X driver 3 collectively one line of the display de Isseki D n from Shift register evening or a latch circuit. The numbers attached to the LP is row (scanning line) numbers of the display data D n taken in the latch circuit of the X driver 3. That is, the X Doraino 3, in the selection period before outputting the signal voltage corresponding to the display de Isseki Dn, beforehand display data Dn is transferred from the controller 5. For example, the line 40 of the display de Isseki, since it is latched by the 40 th LP, is transferred in response to the clock CLX before that. X driver 3 based on the display data Dn latched into the latch circuits, a plurality of voltage levels (ON voltage and OFF voltage, the intermediate voltage, if necessary) from the driving voltage forming circuit 4 is subjected sheet selected from among It outputs a voltage level to the signal electrode.

Then, CLY scanning-signal transfer clock for every one scanning line selection period, FRM is 1 frame - a screen scanning start signal for each beam period. Y driver 2 has a built-in shift register, shift Torejisu evening inputs the screen scanning start signal FRM, sequentially transfers FRM according to the clock CLY. Y driver 2 sequentially outputs the selection voltage (VS or MVS) to the scanning electrodes in accordance with this transfer. Number assigned to CLY denotes the number of the scanning electrodes selected voltage is sign pressurized. For example, when 40 th CL Y is input, from the Y driver 2 to mark pressurizing a selected voltage to one cycle period of the CLY against 40 row scanning electrodes. Incidentally, PD is the partial display control signal for controlling the Y driver 2. Control signal PD is at the "H" level period in the selection voltage from the Y driver 2 (VS or MVS) but is output in sequential scan electrodes, "L" level becomes the period of the non-selection voltage to all the scanning electrodes (VC) is output. Such control prohibits the output of the selection voltage from the Y driver 2 in response to the PD, the gate of the non-selection voltage to all outputs can be easily configured by Rukoto provided Y driver 2. The third line of the scanning electrodes as 44 patients Y3, the line 43 of scan electrode Upushiron43, the signal electrode 80 column as Χ240 the X 80, 240 column of the signal electrode, Fig voltages applied thereto It was shown to. Υ43 and Χ240 is a scanning electrode and the signal electrode of each non-display region. Incidentally, the 80 th pixel of the display area is an on display Te 40 rows to base. Here, VS and MV S are each the positive side and the negative side of the selected voltage, VX and MVX are each positive side and negative side of the signal voltage. VS and MVS are mutually symmetrical VC as the central potential, it is also VX and MVX. The signal electrodes of ON pixels of the row selection voltage VS is applied MVX is applied to the signal electrodes of OFF pixels VX is applied. Further, the signal electrodes of ON pixels of the row selection voltage MVS is applied VX is applied to the signal electrodes of OFF pixels MVX is applied.

PD period 40 lines of the display region D are selected is "H" level, it other than the period becomes "L" level. ? 0 "11" level period Y driver 2 drives the scan electrodes to generate a voltage VS (MVS) that selects one by one row from the first row to the 40 row. The scan electrode output VS and MVS is for each of a plurality scan electrodes units are switched, is line inversion driving. Hisen-option voltage VC is applied to the scanning electrodes other than one row is selected.卩 0 is "1" level period total output of the Y driver 2 is not selected voltage level. Off pixel pressurized Waru effective voltage to the liquid crystal of the selection voltage is not applied 41 line to 240 line in the display region by Ino considerably smaller than the effective voltage applied to the liquid crystal, line 41 to 240 line completely becomes a non-display state. Although during the selection period of the non-display area non-selection voltage level to the scan electrodes are applied , the signal electrode continues to apply a voltage level based on the display data stored in accordance with the X driver 3 or et PD predetermined voltage level, or the X driver 3. However, the non-display line access period in the non-display area signal voltage is to be applied with periodically reversed relative to the VC is preferred. for example, from 1 or by reversing the polarity of the frame period every signal voltage, or the selection period a short has period than long period also A child or periodically reverses the units are preferred.

In the present embodiment, Dn of FIG, as indicated CLX, the LP, de Isseki transfer corresponding to the non-display line access period, display de Isseki transfer to the X driver 3 Line 1 - performed by the amount to be displayed on the line 40, corresponding to the data transfer to be displayed on the line 41 to 240 line is stopped because it is not necessary. Here, the case of a matrix type liquid crystal display panel, then the display data evening transfer rows selected during a corresponding signal voltage to the display of a row that is 4 5 selected X driver 3 outputs since it is necessary to perform, the period for transferring the data is to be preceded by the selection period for one scanning line than PD.

3 2 0 data transfer of the dots of the first line consists of an off-display data of Isseki transfer of the first half 1 6 0 of the dot display data transfer and the second half 1 6 0 dot. The second line to 4 0 row of de one evening transfer in the transfer of only the display data of the first half 1 6 0 dot, the second half of 1 6 0 of dots of O full display data transfer is stopped because it is unnecessary . Since the latch circuit for storing the table shown one row of data (storage circuit) is incorporated in the X driver 3, the right half of the second half 1 6 0 Dots even without bets of data transfer X driver 3 It continues to store the oFF display of data that has been transferred earlier, the right half of the X driver 3 continues to output the signal voltage for turning off the display. Thus the liquid crystal of the right half screen of the upper 4 0 row effective voltage display is turned off is applied.

In the above embodiment, in order to simplify the description, the polarity inversion period of the scanning electrodes adopts a line-sequential driving is sequential selected row by row, the liquid crystal driving voltage center potential VC as a non-selection voltage It was described in a driving method of a 1-frame period. However, as described above with reference to the implementation embodiments, two or sequentially selected for each unit by simultaneously selecting a plurality of scanning electrodes of four such units, a plurality of times the same scanning electrode in one frame period such as selection, it may be used a so-called MLS driving method.

Above As mentioned, the application of a liquid crystal in the off voltage below the effective voltage of the non-display region in the liquid crystal display device of the simple matrix type, hidden when non-display area corresponds to a portion of the scanning electrodes the scanning electrodes in the area to be in a state rather it is constantly applied to the non-selection voltage, also off the signal electrode of the realm to be a non-display state when the non-display area corresponds to a portion of the signal electrode it may be constantly applied voltages to be displayed.

(Embodiment of the first 0)

In a ninth embodiment of the As mentioned earlier, as the structure of the liquid crystal display panel 1 in addition to the simple matrix structure as described above, may be used an active matrix type liquid crystal display device. This embodiment, the liquid crystal display panel 1 as an active matrix type liquid crystal panel, and performs the same drive as the ninth embodiment.

The active matrix type liquid crystal display panel, as described in FIG. 2 2, an active matrix liquid crystal display to place Suitchingu containing 4 6 children consisting of two-terminal nonlinear device such as a Bomaku Daiodo called MIM each pixel panel Ru can be used. In this case, one of a scanning electrode 101 1 2 or the signal electrodes 1 1 3 in the element substrate, it the device 1 1 5 connected, are formed pixel electrodes connected to element 1 1 5, opposing the other by the other electrode is formed on the substrate, scanning to the electrode 1 1 2 and two-terminal nonlinear element between the signal electrodes 1 1 3 1 1 5 and the liquid crystal layer 1 1 4 are electrically connected in series formed by configured. As the driving method, the conducting state element 1 1 5 by applying a selection voltage such as that shown in the scanning electrode 1 1 2 to Y 3 in FIG. 1 6, the liquid crystal signal voltage output to the signal electrodes 1 1 3 write to the layer 1 1 4. The resistance value of the non-selection voltage to the scanning electrodes 1 1 2 Ru applied device 1 1 5 may rise becomes nonconductive, voltage applied to the liquid crystal layer 1 1 4 is held.

Also, as in the equivalent circuit diagram shown in FIG. 2 3, the Akuti blanking matrix type liquid crystal display panel having transistors on the pixels may be used as the liquid crystal display panel 1. This panel is the panel to one of a pair of substrates constituting the (element substrate), both a plurality of scan electrodes 1 1 2 and a plurality of signal electrodes 1 1 3 are formed in a matrix, further, Scanning Electron are electrode 1 1 2 and the signal electrode 1 1 3 a transistor 1 1 7 for each pixel near the intersection with Suitsuchingu element formation, further pixel electrode connected to Suitsuchingu element for each pixel is formed. On the other substrate disposed opposite this substrate a predetermined distance, as required common electrode connected to a co-current position 1 1 8 (common electrode is sometimes you formed on the element substrate) disposed and configured. A liquid crystal layer sandwiched between a pair of substrates, the portion sandwiched between the common electrode and the pixel electrodes are driven for each pixel as a liquid crystal layer 1 1 4 of each pixel. As is well known, the gate of the transistor 1 1 7 disposed for each pixel on the scanning electrodes 1 1 2, the source is the signal electrode 1 1 3 and a drain connected to the pixel electrode. Conductive according to the selection voltage applied during the selection period, it supplies the de Isseki signals to the pixel electrodes through the transistor 1 1 7 conductive. When the non-selection voltage is applied to the scanning electrodes 1 1 2 transitional scan evening 1 1 7 becomes non-conductive. The element substrate is connected as required storage capacity connected to the pixel electrode, it accumulates holds the applied voltage. The transistors 1 1 7 is the case where the element substrate and the insulating substrate such as a glass substrate a thin film transistor evening, a MOS-type transistor when the semiconductor substrate.

In such an active matrix type liquid crystal display device, a method of applying a liquid crystal off voltage or lower of the effective voltage of the pixel located in the non-display area to define the display screen is as follows: 4 7.

As shown in FIG. 1 7, Oite the cut switched transition period from the full-screen display state to the partial display state, at least one frame period (1 F), the liquid crystal of the pixels of at least a non-display region off voltage following to write the voltage. That is, the first frame that migrated to the partial display state to the pixel 1 1 6 to be hidden state (period T in the figure) writes off voltage or lower voltage. In this case, as a hidden line even during the access period "H" level of the non-display region in the first frame portion control signal PD as shown in FIG, a selection voltage is applied to the scanning electrodes 1 1 2 of the non-display region Suitsuchingu device 1 1 5 of each pixel Te, 1 1 7 conducts and by applying the off-voltage following the voltage of the liquid crystal from the X driver 3 to all the signal electrodes 1 1 3, the liquid crystal layer 1 1 of the pixels of the non-display region it is and the child to write the following voltage-off voltage to 4.

Further, the liquid crystal in the case of memory liquid crystal, in the period T, Runode to scan the entire scanning electrodes not, you switch to the "H" level control signal PD only in the non-display line access period, the non-display area given a selection voltage only to the scan electrodes, the non-display region by sequentially selecting only scan electrodes 1 1 2 run corresponding to conduct Suitsuchingu element of a pixel, the pixel liquid crystal layer 1 1 4 only in the non-display region off voltage may be written the following voltage. In this case, during the period T is, the scanning electrodes 1 1 2 corresponding to the display area D non-selection voltage is applied, will not rewrite the voltage of the liquid crystal layer of the pixel.

In the next second and subsequent frames, the non-selective voltage is sign pressurized constantly scanning electrodes 1 1 2 of the non-display area, the switching element 1 1 5, 1 1 7 of a pixel in the non-display area at all times and a non-conductive state Te, have good if remains one frame existed period (period T) to the off-voltage following the voltage written in the pixel 1 1 6 is a transition period to shift a voltage applied to the pixel electrodes on the display state. Since each pixel 1 1 6 denotes a display panel of an active matrix type continuously held by the storage capacitor a voltage applied during the selection period, it is necessary to these procedures.

Further, as shown in FIG. 1 5, the partial display state, and the case of providing the Hiding display region on the same line as the display region D (the non-display area on the right side of the display region D of FIG. 1 5), vertical way of screen direction when the (vertical direction) only providing the non-display area, Rutoshite selection voltage is applied to the scan electrodes is also a signal electrode 1 1 3 regions to become non-display state in the oFF display-off voltage following voltage can be constantly applied to. That way, even if conductive switching element 1 1 5, 1 1 7 by the applied selection voltage to the scanning electrode 1 1 2, off 4 8 voltage continues to be below the voltage applied to the pixel electrode, hide the area.

Above-described method of applying the following effective voltage off voltage to the liquid crystal pixels located in the non-display region may be realized by a simple circuit means. The partial display region D, when formed in the vertical direction of the screen (vertical direction), the controller 5 in the partial display state, much of the driving voltage forming circuit 4 and X driver 3 and the Y driver 2 non It can be stopped in the display line access period, and normally one if white is preparative off display than for pixels of the non-display area at a low voltage is applied, considerably the power consumption of the driving circuit it can be reduced.

Also, if there one white preparative normally, such as in the liquid crystal of the horizontal alignment type liquid crystal molecules in the non-display area is horizontally oriented. Since liquid crystal molecules are permittivity of the liquid crystal is small in a horizontal alignment state, the charging and discharging current due to the liquid crystal in the non-display area becomes smaller, as compared with the case of full-screen display state, to significantly reduce the power consumption of the entire display device can. According to the ninth and the first 0 of the embodiment as described above, the display state of only a portion of the realm of the whole screen, which can be partial display state to the other area and non-display state reflection in type or semi-transmission type liquid crystal display device, while realizing Viewing no discomfort when the partial display state, it is possible to greatly reduce power consumption.

The embodiments of the first to 1 0, not only the liquid crystal display device, the scanning electrodes and signal electrodes arranged in a matrix also be applied to construction and other electro-optical device comprising a pixel can. For example, a plasma display panel (PDP), electrospray thickening net sense (EL), can also be applied to such field E mission device (FED). (Embodiment of the electronic equipment)

Figure 2 4 is a view showing an appearance of an electronic apparatus according to the present invention. 2 2 1 is a portable-type information equipment, has a built-in mobile phone function, and a battery as a power supply. 2 2 1 is a display device using a matrix type electro-optical device or a liquid crystal display device according to any of the embodiments described above, becomes the full-screen display state as shown in figure when needed, for example 4 9 Bas only Table view area of ​​2 2 1 D during standby, such as during waiting of the phone, which is part of the display device 2 2 1 is partially visible. 2 3 0 is a pen as an input means, for Tsuchipaneru evening in front of the display device 2 2 1 is arranged, while viewing the display device 2 2 1 screen, press the display portion by the pen 2 3 0 it is possible to Suitsuchi input by.

Figure 2 5 shows an example of a partial circuit Proc diagram of an electronic apparatus of the present invention. 2 2 2 controls the entire electronic instrument 〃 PU (micro-processor Yunitto) 2 2 3 memory for storing various programs and information and display de Isseki like, 2 2 4 becomes time standard source Crystal it is a vibrator. 〃 PU 2 2 2 by a crystal oscillator 2 2 4 supplies to each circuit block generates an operation clock signal of the electronic device 2 2 within 0. These circuit blocks are connected to each other via a system bus 2 2 5, it is also connected to other blocks such as input and output devices. Further to these circuit blocks that have been powered from the battery power supply 6. The display device 2 2 1, for example, a liquid crystal display panel 1 as shown in FIG. 1, Y driver 2, X driver 3, the driving voltage generating circuit 4 includes a controller 5. It may also serve as the function of the controller 5 in / z PU 2 2 2.

Here, by using an electro-optical device and a liquid crystal display device according to the above-described embodiments as a display device 2 2 1, interesting and the screen portions Display state on with reduced power consumption during the entire electronic device waits originality it is possible to have sex.

Further, a display device, and when a reflection type display device, the display device transmission when using a light source is transmitted through the illumination light when even the light source not in use while having a backlight lighting light source in reflective display of preferable because the case of the the display transflective type display device, can be extended further suppressed by battery life and power consumption. Furthermore, the in the electronic apparatus of the present invention, during standby after the state in which equipment is not operated has passed a predetermined time, the display device is a partial display state, reduce power consumption by the drive of the display device driver or controller in, it can be extended further battery life.

[Industrial Applicability]

The present invention is, for example, in a long electronic equipment in the standby time, such as a mobile phone, the mode of the display device during the scan evening Mumbai, by partial display state and 5 0 to display only the necessary portion, low-electronics it is capable of power.

Claims

5 1 billed of range
1. A plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving method of an electro-optical device having a function to display screen partially display area, the scan electrode of the display region, non-selective voltage is applied to the non-selection period to apply a selection voltage to the selection period, and
The period other than the selection period for the scanning electrodes of said display area, by at least a predetermined time period the voltage applied to all the signal electrodes fixes the applied voltage to all the scanning electrodes are fixed,
The partial display state the display screen
The method of driving an electro-optical device, characterized in that.
2. In claim 1, the driving method for an electro-optical device, wherein a voltage of the scan electrodes in the period with a fixed voltage applied to all the scanning electrodes and the non-selection voltage ο
3. In claim 2, the driving method of the electric optical apparatus, wherein the non-selective voltage is 1 level.
4. Period in any one of claims 1 to 3, forming circuit of the drive voltage applied to the scanning electrode and the signal electrode, to fix the respective voltage applied to all the scanning electrodes and all the signal electrodes the driving method for an electro-optical device, characterized in that the operation stop.
5. The method of claim 4, wherein the driving voltage forming circuit includes a charge pump circuit for generating a boosted voltage or low voltage is switched in response to clock the connection of a plurality of capacitors, the charge pump circuit, the period of fixing the respective voltage applied to all the scanning electrodes and all the signal electrodes, the driving method for an electro-optic device characterized in that it is deactivated.
6. In any one of claims 1 to 5, a first display mode and a non-display state display part of the area state, the other areas of the display screen to display the entire state of the display screen and a second display mode one de to, the period for applying a selection voltage to the scanning electrodes of said display area in the first display mode and said second display mode does not change 5 2 the method of driving an electro-optical device, characterized in that.
7. The method of claim 6, wherein in the first display mode and said second display mode, so that the effective voltage applied to the liquid crystal of pixels in the display area in the display state are the same, the the driving method of an electro-optical device and sets a potential mark addition to the signal electrodes in the period other than the selection period for the scanning electrodes in the display region.
8. In claim 7, the potential applied to the signal electrodes in the period other than the selection period for the scanning electrodes of the display region, to the signal electrodes in the case of the ON-display or off the display when the first display mode the driving method of an electro-optical device and sets the voltage applied to the same.
9. The method of claim 8, wherein the plurality of scan electrodes, and simultaneous selection for each predetermined number of units are driven so as to sequentially select each number predetermined unit,
The voltage applied to the signal electrodes in the case of the ON-display or off the display in the second display mode, applied to the signal electrodes in the case of full-screen ON-display or full screen OFF-display in said first display mode the method of driving an electro-optical device, characterized in that the voltage is the same as.
1 0. In any one of claims 1 to 9, the potential applied to the signal electrodes in the period other than between selection 択期 scanning electrodes of said display region, for each of the predetermined period for one screen scan, full screen the driving method of an electro-optical device and sets switch between applied potential of the applied potential and off displayed to If when turning on the display in the display state alternately.
1 1. In any one of claims 6 to 1 0, the voltage difference between the in a period other than the selection period for the scanning electrodes in the second the display area definitive display mode of the signal electrode and the scan electrode electro-optical equipment in the driving method of the polarities, characterized by comprising inverted every frame.
1 2. A plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving method of an electro-optical device having a function to display screen partially display area, the scan electrodes of the display region is a non-selective voltage is applied to the non-selection period to apply a selection voltage to the selection period, and
Wherein the scanning electrodes other areas of the display screen, and applies the non-selective 5 3 voltage without applying the selection voltage, for all of the signal electrodes, the polarity inversion driving when the full-screen display state at least longer than the same-polarity driving period by fixing the voltage applied to the display screen and a partial display state in the
The method of driving an electro-optical device, characterized in that.
In 1 3. Claim 1 2, wherein at least every period longer than the same-polarity driving period in the polarity inversion driving when the full-screen display state, the voltage applied to the signal electrodes, turning on the display in the full screen display state the method of driving an electro-optical device characterized by alternately switching the potential when when displaying potential and off.
1 4. The electro-optical device according to any one of claims 1 to 1 3, a driving method of an electro-optical device characterized in that it is a simple Matrigel box-type liquid crystal display device.
1 5. The electro-optical device according to any one of claims 1 to 1 3, a driving method for an electro-optical device, characterized in that an active matrix liquid crystal display device.
1 6. Claims 1 to electro-optical device according to claim I connexion driven that the driving method of the electro-optical device according to any one of 1 5.
1 7. A plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, in the electro-optical device having a function to display screen partially display area,
Wherein the plurality of scan electrodes, a selection voltage is applied to the selection period, the scanning electrode driving circuit for applying a non-selection voltage to the non-selection period,
Wherein the plurality of signal electrodes, and the signal electrode driving circuit for applying a signal voltage corresponding to display data,
Setting means for setting the position information of the partial display area in the display screen,
Based on the position information set in said setting means, and control means for outputting a partial display control signal for controlling the scan electrode driving circuit and the signal electrode driving circuit, the scan electrode driving circuit and the signal electrode drive circuit, in response to the partial display control signal, the scanning electrode and the signal electrode of the display region in the display screen is driven so that the display corresponding to the display data, non of the display screen a non-display state to continue applying a non-selection voltage to the scanning electrodes in the display region
Electro-optical device, characterized in that.
1 8. The electro-optical device according to claim 1 7, the electro-optical apparatus characterized by a simple matrix type liquid crystal display device 5 4 there.
1 9. The electro-optical device according to claim 1 7, the electro-optical device which is a § active matrix liquid crystal display device.
2 0. A plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving circuit for an electro-optical device having a function to display screen partially visible region, the voltage to the plurality of scan electrodes a first driving means for applying, provided with a memory circuit of the display data, a second drive for applying voltage voltage selected depending on Isseki the display de read from here to the plurality of signal electrodes and a means,
Said first drive means, the scanning electrodes of the display area, the non-non-selective voltage is applied during the selection period, and run scan electrodes in another region of the display screen as well as indicia pressurizing the selection voltage to the selection period to have a function of applying only the non-selection voltage,
Function wherein the second drive means, the period corresponding to the selection period of the scanning electrodes of said display area reads the display data from said storage circuit, in other periods for fixing the display data reading Adoresu of the memory circuit with a
The driving circuit of the electro-optical device, characterized in that.
2 1. In claim 2 0, in a period other than the selection period for the scanning electrodes of said display region, electro-optics and feature by comprising stop Shift register evening shift operation in the first drive means the drive circuit of the device.
2 2. A plurality of scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, the driving circuit for an electro-optical device having the function of partially display area display screen, depending on the Shift register evening shift operation Te has a scan electrode driving circuit that indicia pressurized sequentially selected voltage to the plurality of scanning electrodes,
Said scanning electrode driving circuit, when the display screen partially display area, the sheet Futorejisu selected voltage between the selection to the scanning electrodes in the display area of ​​the display screen period in accordance with the evening shift operation was applied to the scanning electrodes of the other area of ​​the display screen is stopped halfway the shift operation of the shift Torejisu evening, it is applied only the non-selection voltage,
It said scanning electrode driving circuit, at the time of transition from the state to the display screen partially display area to the full-screen display state, and wherein the 5 5 to have a default setting means for the Shift register evening and initial state the driving circuit of the electro-optical device for.
2 3. Claim 2 0 to the driving circuit for an electro-optical device according to 2 2 any one of the electric light 2 4, characterized in that it comprises a scanning electrode and a signal electrode thereby driven. More the scanning electrodes and a plurality of signal electrodes are constituted by crossed configuration, in the electro-optical device having the function of partially display area display screen,
Voltage applying a first driving means for applying a voltage to the plurality of scan electrodes, a voltage selected according to the display data read out from here comprises a memory circuit of the display data to the plurality of signal electrodes and a second driving means for,
It said first drive means, the scanning electrodes in the display area of ​​the display screen, a non-selective voltage is applied to the non-selection period to apply a selected voltage to the selection period, and the other area of ​​the display screen wherein the scan electrode has a function of applying only the non-selection voltage,
Said second drive means to said plurality of signal electrodes, wherein the selection period of the scanning electrodes in the display region by applying a voltage based on the display de Isseki read from said memory circuit, its is a period other than It has a function of applying a voltage based on the same display de Isseki in
Electro-optical device, characterized in that.
In 2 5. Claims 2 to 4, in a period other than the selection period for the scanning electrodes of said display area, said second driving means is at least than the same-polarity driving period in the polarity inversion driving when the full-screen display state every long period, the voltage applied to the signal electrodes, the electro-optical device, characterized in that to switch alternately to the potential of the case of displaying the potential and off when the oN display in full screen display state.
2 6. In any one of claims 2 3 to 2 5, to form a voltage applied to the scanning electrodes or the signal electrodes have a drive voltage generating circuit for supplying to said drive means, said drive voltage forming circuitry saw including a contrast adjustment circuit for adjusting the voltage of the applied voltage,
Wherein the period other than the selection period for the scanning electrodes in the display region, the electro-optical device characterized by comprising stop the operation of the contrast adjustment circuit.
2 7. And the partial region display state of the entire screen of the liquid crystal display panel, 5 6 driving method of partially reflective type capable of displaying state or semi-transmissive for the other regions and non-display state in,
Wherein the liquid crystal display panel with a normally one white preparative driving method of the partial display liquid crystal display device you and applying a less effective voltage off voltage of the state in the liquid crystal of the non-display area.
2 8. In the claims 2 7, wherein the liquid crystal display panel is a simple matrix type liquid crystal panel, liquid crystal and applying a non-selection voltage only to the scanning electrodes of the non-display area in the partial display state the driving method of the display device.
In 2 9. Claim 2 7 or 2 8, wherein the liquid crystal display panel is a passive matrix scheme liquid crystal panel, applying only a voltage which becomes O full display to the signal electrodes of the non-display area in the partial display state method of driving a liquid crystal display device, characterized in that.
3 0. In the claims 2 7, wherein the liquid crystal display panel is an active matrix type liquid crystal panel, said part at least the first frame moves to a display state before Symbol LCD off voltage below the pixel of the non-display region method of driving a liquid crystal display device, wherein a voltage is applied, applying a non-selection voltage only from subsequent frames to the scan electrodes of the non-display area.
3 1. In claims 2 7 or 3 0, wherein the liquid crystal display panel is a active matrix box mode liquid crystal panel, the liquid crystal turns off the pixel of at least the first frame the non-display region in which transition to the partial display state method for driving a liquid crystal display device by applying a voltage below the voltage, the access period from the subsequent frame the non-display region, characterized in that the indicia pressurizing only the following voltage off voltage to the signal electrodes.
3 2. The liquid crystal display device characterized by being displayed Te cowpea method of driving the liquid crystal display device according to any one of claims 2 7 to 3 1.
3 3. Claims 1 6 to 1 9, claim 2 3 or 2 6, an electro-optical device or a liquid crystal display device according to any one of claims 3 2, features to become used as a display device an electronic device.
PCT/JP1999/000552 1998-02-09 1999-02-08 Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device WO1999040561A1 (en)

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KR1019997009243A KR100654073B1 (en) 1998-02-09 1999-02-08 Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device
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EP99902863A EP0974952B1 (en) 1998-02-09 1999-02-08 Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device
US09/402,625 US6522319B1 (en) 1998-02-09 1999-02-08 Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device
JP54029399A JP3588802B2 (en) 1998-02-09 1999-02-08 Electro-optical device and a driving method thereof, a liquid crystal display device and a driving method thereof, a driving circuit of an electro-optical device and an electronic apparatus,

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US10/190,687 Continuation US6900788B2 (en) 1998-02-09 2002-07-09 Electrooptical apparatus and driving method therefor, liquid crystal display apparatus and driving method therefor, electrooptical apparatus and driving circuit therefor, and electronic equipment

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DE69935285T2 (en) 2007-11-08
EP0974952A1 (en) 2000-01-26
CN1262761A (en) 2000-08-09
JP3588802B2 (en) 2004-11-17
CN1516102A (en) 2004-07-28
CN1145921C (en) 2004-04-14
US20020175887A1 (en) 2002-11-28
KR100654073B1 (en) 2006-12-07
EP1583071A3 (en) 2006-08-23
DE69935285D1 (en) 2007-04-12
EP1577874A3 (en) 2006-09-13
EP1600931A2 (en) 2005-11-30
EP1600931A3 (en) 2006-08-23
EP0974952A4 (en) 2004-04-14
KR20010006164A (en) 2001-01-26
US6900788B2 (en) 2005-05-31
EP1583071A2 (en) 2005-10-05
US6522319B1 (en) 2003-02-18
TW530286B (en) 2003-05-01
EP0974952B1 (en) 2007-02-28
EP1577874A2 (en) 2005-09-21

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